If I'd had any idea what she was like, do you really think I'd have befriended her?"

Roz took the chair she had sat in before and surrept.i.tiously switched on the tape-recorder in her handbag. Hal walked to the window and looked out. Mrs. Clarke was sitting on the small patio at the back of the house, her face, vacant of expression, turned towards the sun.

"You and Olive were rather more than friends," he said without hostility, turning back into the room.

"We didn't harm anyone," said Mr. Clarke, unconsciously echoing Olive.

Roz wondered how old he was. Seventy? He looked more, worn out by care of his wife perhaps. The rough wig she had painted on cellophane over his photograph had been a revelation. It was quite true that hair made a man look younger. He squeezed his hands between his knees as if unsure what to do with them.

"Or should I say we did not set out with the intention to harm anyone.

What Olive did was incomprehensible to me."

"But you felt no responsibility for it?"

He stared at the carpet, unable to look at either of them.

"I a.s.sumed she had always been unstable," he said.

"Why?"

"Her sister was. I thought it was a genetic thing."

"So she behaved oddly before the murders?"

"No," he admitted.

"As I say, I wouldn't have pursued' he paused *the relationship if I had known the kind of person she was."

Hal changed tack.

"What exactly was your relationship with Olive's father?"

He clamped his knees tighter about his hands.

"Friendly."

"How friendly?"

Mr. Clarke sighed.

"Does it matter now? It was a long time ago and Robert is dead." His eyes drifted towards the window.

"It matters," said Hal brusquely.

"We were very friendly."

"Did you have a s.e.xual relationship?"

"Briefly." His hands struggled from between his knees and he buried his face in them.

"It sounds so sordid now, but it really wasn't. You have to understand how lonely I was. G.o.d knows it's not her fault, but my wife has never been much in the way of a companion. We married late, no children, and her mind has never been strong. I became her nurse and keeper before we'd been married five years, imprisoned in my own house with someone I could barely communicate with." He swallowed painfully.

"Robert's friendship was all I had and he, as you obviously know, was h.o.m.os.e.xual. His marriage was as much a prison as mine, though for different reasons." He pressed the bridge of his nose with a finger and thumb.

"The s.e.xual nature of the relationship was simply a by-product of our dependence on each other. It mattered a great deal to Robert and very much less to me, though I admit that at the time a period of three or four months only I genuinely believed myself to be a h.o.m.os.e.xual."

"Then you fell in love with Olive?"

"Yes," said Mr. Clarke simply.

"She was very like her father, of course, intelligent, sensitive, really quite charming when she wanted to be, and extraordinarily sympathetic. She made so few demands, unlike my wife." He sighed.

"It seems strange to say it, in view of what happened later, but she was a very comfortable person to be with."

"Did Olive know about your relationship with her father?"

"Not from me. She was very naY ve in many respects."

"And Robert didn't know about you and Olive."

"No."

"You were playing with fire, Mr. Clarke."

"I didn't plan it, Sergeant. It happened. All I can say in my defence is that I ceased being' he sought for the right word - *intimate with Robert the minute I recognised my feelings for Olive. We did not stop being friends, however. That would have been cruel."

"Bulls.h.i.t!" said Hal with calculated anger.

"You didn't want to be found out. My guess is you were shafting both of them at the same time and loving every exciting minute of it. And you have the b.l.o.o.d.y gall to say you don't feel responsible!"

"Why should I?" Clarke said with a flash of spirit.

"My name was never mentioned by either of them. Do you imagine it wouldn't have been if I had unwittingly precipitated the tragedy?"

Roz smiled contemptuously.

"Did you never wonder why Robert Martin wouldn't speak to you after the murders?"

"I a.s.sumed he was too distressed."

"I think you feel a little more than simple distress when you discover that your lover has seduced your daughter," she said ironically.

"Of course you precipitated it, Mr. Clarke, and you knew it. But, by G.o.d, you weren't going to say anything. You'd rather see the entire Martin family destroy itself than prejudice your own position."

"Was that so unreasonable?" he protested.

"They were free to name me. They didn't. How would it have helped if I had spoken out? Gwen and Amber would still have been dead.

Olive would still have gone to prison." He turned to Hal.

"I regret intensely my involvement with the family but I really can't be held responsible if my connection with them led to tragedy.

There was nothing illegal about what I did."

Hal looked out of the window again.

"Tell us why you moved, Mr. Clarke. Was it your decision or your wife's?"

He damped his hands between his knees again.

"It was a joint decision. Life there became unbearable for both of us.

We saw ghosts everywhere. A change of environment seemed the only sensible course."

"Why were you so keen to keep your forwarding address secret?"

Clarke raised haunted eyes.

"To avoid the past catching up with me. I've lived in constant dread of this." He looked at Roz.

"It's almost a relief to have it out in the open at last. You probably won't believe that."

She gave a tight smile.

"The police took a statement from your wife on the day of the murders, saying that she saw Gwen and Amber on the doorstep that morning after you and Robert left for work. But when I came here the other day, she said she had lied about it."

"I can only repeat what I said to you then," he answered wearily.

"Dorothy's senile. You can't put any reliance on anything she says.

She doesn't even know what day it is most of the time."

"Was she telling the truth five years ago?"

He nodded.

"In so far as saying they were alive when I left for work, yes, she was. Amber was at the window, watching. I saw her myself. She ducked behind the curtain when I waved at her. I remember thinking how odd that was." He paused.

"As to whether Dorothy saw Robert leave," he resumed after a moment, "I don't know. She said she did and I've always understood that Robert had a cast-iron alibi."

"Has your wife ever mentioned seeing the bodies, Mr. Clarke?" asked Hal casually.

"Good G.o.d, no." He sounded genuinely shocked.

"I just wondered why she saw ghosts. She wasn't particularly friendly with Gwen or Amber, was she? Rather the reverse, I'd have thought, in view of the amount of time you spent at the Martins' house."

"Everyone in that road saw ghosts," he said bleakly.

"We all knew what Olive had done to those wretched women. It would have required a very dull imagination not to see ghosts."

"Can you remember what your wife was wearing the morning of the murders?"

He stared at Hal, surprised by the sudden switch.

"Why do you ask?"

"We've had a report that a woman was seen walking down past the Martins' garage." The lie rolled glibly off his tongue.

"From the description it was too small for Olive but whoever it was was dressed in what looked like a smart black suit. We'd like to trace her. Could it have been your wife?"

The man's relief was palpable.

"No. She never had a black suit."

"Was she wearing anything black that morning?"

"No. She wore a floral overall."

"You're very certain."

"She always wore it, every morning, to do the housework.

She used to get dressed after she'd finished. Except Sundays.

She didn't do housework on Sundays."

Hal nodded.

"The same overall every morning? What happened when it got dirty?"

Clarke frowned, puzzled by the line of questioning.

"She had another one, a plain blue one. But she was definitely wearing the floral one on the day of the murders."

"Which one was she wearing the day after the murders?"

He licked his lips nervously.

"I can't remember."

"It was the blue one, wasn't it? And she went on wearing the blue one, I suspect, until you or she bought a spare."

"I can't remember."

Hal smiled unpleasantly.

"Does she still have her floral overall, Mr. Clarke?"