Once more she paused, and, pushing away the tray, I lit myself a cigar. "It's lucky you've had some practice in surprises," I observed.

Joyce nodded. "Of course I was absolutely flabbergasted, but I don't think I showed anything. I sort of rummaged in my bag for a minute till I'd recovered; then I gave the man half a crown and asked him if he knew how long Dr. McMurtrie was staying. I think he was in doubt as to whether I was a female detective or a lady reporter; anyhow he took the money and said he was very sorry he didn't know, but that if I wanted an interview at any time he had no doubt it might be arranged.

I thanked him, and said it didn't matter for the moment, and there I thought it best to leave things. You see I knew that whether McMurtrie stayed on at the Russell or not you were bound to see him again, and there was nothing to be gained by asking questions which the porter would probably repeat to him. It would only have helped to put him on his guard--wouldn't it?"

"My dear Joyce," I said, "I think you did splendidly. Sherlock Holmes couldn't have done better." I got up and walked to the end of the c.o.c.kpit. "But good Lord!" I added, "this does complicate matters.

You're absolutely certain it was McMurtrie you saw at Marks's flat?"

"Absolutely," repeated Joyce with emphasis. "I should remember his face if I lived to be a hundred."

I clenched my fists in a sudden spasm of anger. "There's some d.a.m.ned villainy underneath all this, Joyce," I said. "If McMurtrie was there that afternoon the odds are that he knows who committed the murder."

"He did it himself," said Joyce calmly. "I'm as sure of it as I am that I'm sitting here."

"But why?" I demanded--"why? Who on earth _was_ Marks? n.o.body in Chelsea seemed to know anything about him, and nothing came out at the trial. Why should any one have wanted to kill him except me?"

Joyce shook her head. "I don't know," she said stubbornly; "but I'm quite certain it was McMurtrie. I feel it inside me."

"And in any case," I continued, "what the devil is he doing messing about with George? I'm the only connecting-link between them, and he can't possibly mean to betray me--at all events, until he's got the secret of the powder. He knows George would give me up tomorrow."

Joyce made a gesture of perplexity. "I know," she said. "It's an absolute mystery to me too. I've been puzzling and puzzling over it till my head aches, and I can't see any sort of explanation at all."

"The only thing that's quite plain," I said, "is the fact that McMurtrie and Savaroff have been lying to me from the start. They are no more powder-merchants than you are. They want to get hold of my invention for some reason--to make money out of it, I suppose--and then they're prepared to clear out and leave me to George and the police. At least, that's what it's beginning to look like."

"Well, anyhow," said Joyce, "you're not tied to them any longer by your promise."

"No," I said; "it takes two to keep a bargain. Besides," I added rather bitterly, "I can afford the privilege of breaking my word. It's only what you'd expect from a convict."

Joyce got up, and coming to where I was sitting, slipped her arm through mine and softly stroked my hand. "Don't, Neil," she said.

"I hate you to say anything that isn't fine and generous. It's like hearing music out of tune."

I drew her to me, and half closing her eyes, she laid her cheek against mine. We remained silent for a moment or two, and then, giving her a little hug, I sat up and took hold of her hands.

"Look here, Joyce," I said, "we won't just bother about anything for the rest of the day. We'll be cheerful and jolly and foolish, like we were on Friday. G.o.d knows how all this infernal tangle is going to pan out, but we may as well s.n.a.t.c.h one evening's happiness out of it while we've got the chance."

Joyce kissed me, and then jumping lightly from the seat, pulled me up with her. "We will," she said. "After all, we've got a boat and a lovely evening and a cold pheasant and a bottle of champagne--what more can any one want?"

"Well," I said, "it may sound greedy, but as a matter of fact I want some of those peas and new potatoes you were talking about just now."

She let go my hands, and opening one of the lockers, took out a large basin with a couple of bags in it. "There you are," she laughed. "You can skin them and sh.e.l.l them while I wash up the tea-things and lay the table. It's a man's duty to do the dangerous work."

Joyce had always had the gift of scattering a kind of infectious gaiety around her, and that night she seemed to be in her most bewitching and delightful mood. I think she made up her mind to try and wipe out from my memory for the time being all thoughts of the somewhat hara.s.sed state of existence in which it had pleased Providence to land me. If so, she succeeded admirably.

We cooked the supper between us. I boiled the peas and potatoes, and then, when we had done the first course, Joyce got up and made a brilliantly successful French omelette out of some fresh eggs which she had brought down for that inspired purpose.

It was very charming in the little low-ceilinged cabin, with the lamp swinging overhead and no sound outside but the soft lapping of the tide upon the sides of the boat. We lay and talked for some time after we had finished, while I smoked a cigar, and Joyce, stretched out luxuriously on the other bunk, indulged in a couple of cigarettes.

"We won't wash up," I said. "I'll just shove everything through into the fo'c's'le, and we'll leave them there for Mr. Gow. A certain amount of exercise will be good for him after his holiday."

"Do," said Joyce sleepily. "And then come and sit over here, Neil. I want to stroke your hair."

I cleared away the things, and shutting up the table, which worked on a hinge, spread out my own cushions on the floor alongside of Joyce's bunk. The latter was just low enough to let me rest my head comfortably on her shoulder.

How long we lay like that I really don't know. My whole body and mind were steeped in a strange, delightful sense of peace and contentment, and I began to realize, I think for the first time, how utterly necessary and dear to me Joyce had become. I slid my arm underneath her--she lay close up against me, her hair, which she had loosened from its fastenings, half covering us both in its soft beauty.

The lamp flickered and died down, but we didn't trouble to relight it.

Outside the night grew darker and darker, and through the open hatch we could just see a solitary star shining down on us from between two banks of cloud. Cool and sweet, a faint breeze drifted in from the silent marshes.

Then, quite suddenly, it seemed to me, a strange madness and music filled the night for both of us. I only knew that Joyce was in my arms and that we were kissing each other with fierce, unheeding pa.s.sion.

There were tears on her cheeks--little sweet, salt tears of love and happiness that felt all wet against my lips.

It was only a moment--just one brief moment of unutterable beauty--and then I remembered. With a groan I half raised myself in the darkness.

"I must go, Joyce," I whispered. "I can't stay here. I daren't."

She slipped her soft bare arms round my neck, and drew my face down to hers.

"Don't go," she whispered back. "Not if you don't want to. What does it matter? I am all yours, Neil, anyway."

For a moment I felt her warm fragrant breath upon my face, and her heart beating quickly against mine. Then, with an effort--a big effort--I tore myself away.

"Joyce dear," I said, "it would only make things worse. Oh, my dear sweet Joyce, I want you like the night wants the dawn, but we can't cheat life. Suppose we fail--suppose there's only death or prison in front of me. It will be hard enough now, but if--"

I broke off, and with a little sob Joyce sat up and felt for my hand.

"You're right, darling," she said; "but oh, my dear, my dear!" She lifted up my hand and pa.s.sed it softly backwards and forwards across her eyes. Then, with a little laugh that had tears close behind it, she added: "Do you know, my Neil, I'm conceited enough to think you're rather wonderful."

I bent down and kissed her with infinite tenderness.

"I am, Joyce," I said. "Exactly how wonderful you'll never know."

Then I lifted her up in my arms, and we went out of the cabin into the cool darkness of the night.

"I'll row myself ash.o.r.e," I said, "and leave the dinghy on the beach.

I shall be back about four o'clock, if that's not too early for you.

We ought to get our explosion over before there's any one about."

Joyce nodded. "I don't mind how early you come. The sooner the better."

"Try and get some sleep," I added; "you'll be tired out tomorrow if you don't."

"I'll try," said Joyce simply; "but I don't think I shall. I'm not even sure I want to."

I kissed her once more, and slipping down into the dinghy, pulled off for the sh.o.r.e. Everything around was dark and silent--the faint splash of my oars alone breaking the utter stillness. Landing at my usual spot, more by luck than judgment, I tugged the boat up out of reach of the tide, and then, turning round, waved good-night to the _Betty_.

It was too dark to see anything, but I think Joyce sent me back my message.