‘There’s not much more. She drove Garcia to his warehouse. He’d got the keys. She murdered him there, because she was hell-bent on marrying Pilgrim, and becoming a very rich peeress, and because it was in Garcia’s power to stop her. She’s an egomaniac. She drove the caravan back to your garage and drove herself back to the Pascoes’ house in Pilgrim’s car. The distance to the warehouse is thirty miles. At that time of night she’d do it easily in an hour and a half. She must have been back at the studio by three and probably got to the Pascoes’ by half-past. Even supposing she lost her way—and I don’t think she would, because there’s a good map in the caravan—she’d a margin of two hours before there was a chance of the servants being about.’

‘Why didn’t you think it was Pilgrim?’

‘I wondered if it was Pilgrim, of course. After we had checked all the alibis, it seemed to me that Pilgrim and Valmai Seacliff were by far the most likely. I even wondered if Pilgrim had drugged Seacliff with aspirin instead of Seacliff drugging Pilgrim—until she lied about her cut hand, her horsemanship and the address of the warehouse. On top of that there was the glove and the smell of the raincoat. She said she had taken the aspirins Pilgrim gave her. We found that she hadn’t. We found that she had aspirins of her own in the evening bag she had taken to Boxover. Why should she pretend she had none? And why, after all, should Pilgrim kill Garcia? He had paid Sonia off, but as far as we know, Garcia had kept out of the picture where Pilgrim was concerned. Garcia was tackling Valmai Seacliff, not Pilgrim. No, the weight of evidence was against her. She lied where an innocent woman would not have lied. And—I’m finishing up where I began—I think that an innocent person would not have pressed Sonia down upon the point of that knife after she had cried out. She would not have disregarded that first convulsive start. She murdered Sonia, knowing the knife was there, as deliberately as she murdered Garcia.’

‘Will they find her guilty?’

‘I don’t know, Troy. Her behaviour when we arrested her was pretty damning. She turned on Pilgrim like a wild cat because he kept saying he’d swear she’d never worn the coat. If he’d said she had often worn it, half our case would have gone up in smoke.’

Alleyn was silent for a moment, and then knelt down on the rug beside Troy.

‘Has this all made a great difference to you?’ he said. ‘Is it going to take you a long time to put it behind you?’

‘I don’t know. It’s been a bit of a shock for all of us.’