Jack nodded.

They were walking down the road towards the officers' waiting car, when Jack asked:

"May I see that letter again?"

The detective took it from his pocket book and Jack stopped and scanned it.

"Yes, it is her writing," he said and then uttered an exclamation.

"Do you see that?"

He pointed eagerly to two little marks before the words "Dear friend."

"Quotation marks," said the detective, puzzled. "Why did she write that?"

"I've got it," said Jack. "The story! Mademoiselle Briggerland told me she was writing a story, and I remember she said she had writer's cramp.

Suppose she dictated a portion of the story to Mrs. Meredith, and suppose in that story there occurred this letter: Lydia would have put the quotation marks mechanically."

The detective took the letter from his hand.

"It is possible," he said. "The writing is very even--it shows no sign of agitation, and of course the character's initials might be 'L.M.' It is an ingenious hypothesis, and not wholly improbable, but if this were a part of the story, there would be other sheets. Would you like me to search the house?"

Jack shook his head.

"She's much too clever to have them in the house," he said. "More likely she's put them in the fire."

"What fire?" asked the detective dryly. "These houses have no fires, they're central heated--unless she went to the kitchen."

"Which she wouldn't do," said Jack thoughtfully. "No, she'd burn them in the garden."

The detective nodded, and they returned to the house.

Jean, deep in conversation with her father, saw them reappear, and watched them as they walked slowly across the lawn toward the trees, their eyes fixed on the ground.

"What are they looking for?" she asked with a frown.

"I'll go and see," said Briggerland, but she caught his arm.

"Do you think they'll tell you?" she asked sarcastically.

She ran up to her own room and watched them from behind a curtain.

Presently they pa.s.sed out of sight to the other side of the house, and she went into Lydia's room and overlooked them from there. Suddenly she saw the detective stoop and pick up something from the ground, and her teeth set.

"The burnt story," she said. "I never dreamt they'd look for that."

It was only a sc.r.a.p they found, but it was in Lydia's writing, and the pencil mark was clearly visible on the charred ashes.

"'Laura Martin,'" read the detective. "'L.M.,' and there are the words 'tragic' and 'remorse'."

From the remainder of the charred fragments they collected nothing of importance. Jean watched them disappear along the avenue, and went down to her father.

"I had a fright," she said.

"You look as if you've still got it," he said. He eyed her keenly.

She shook her head.

"Father, you must understand that this adventure may end disastrously.

There are ninety-nine chances against the truth being known, but it is the extra chance that is worrying me. We ought to have settled Lydia more quietly, more naturally. There was too much melodrama and shooting, but I don't see how we could have done anything else--Mordon was very tiresome."

"Where did Glover come from?" asked Mr. Briggerland.

"He's been here all the time," said the girl.

"What?"

She nodded.

"He was old Jaggs. I had an idea he was, but I was certain when I remembered that he had stayed at Lydia's flat."

He put down his tea cup and wiped his lips with a silk handkerchief.

"I wish this business was over," he said fretfully. "It looks as if we shall have trouble."

"Of course we shall," she said coldly. "You didn't expect to get a fortune of six hundred thousand pounds without trouble, did you? I dare say we shall be suspected. But it takes a lot of suspicion to worry me.

We'll be in calm water soon, for the rest of our lives."

"I hope so," he said without any great conviction.

Mrs. Cole-Mortimer was prostrate and in bed, and Jean had no patience to see her.

She herself ordered the dinner, and they had finished when a visitor in the shape of Mr. Marcus Stepney came in.

It was unusual of Marcus to appear at the dinner hour, except in evening dress, and she remarked the fact wonderingly.

"Can I have a word with you, Jean?" he asked.

"What is it, what is it?" asked Mr. Briggerland testily. "Haven't we had enough mysteries?"

Marcus eyed him without favour.

"We'll have another one, if you don't mind," he said unpleasantly, and the girl, whose every sense was alert, picked up a wrap and walked into the garden, with Marcus following on her heels.

Ten minutes pa.s.sed and they did not return, a quarter of an hour went by, and Mr. Briggerland grew uneasy. He got up from his chair, put down his book, and was half-way across the room when the door opened and Jack Glover came in, followed by the detective.

It was the Frenchman who spoke.

"M'sieur Briggerland, I have a warrant from the Prefect of the Alpes Maritimes for your arrest."