“No, she was out. She usually is, I’m told. In fact, her habits seem to be expensive, irregular and mysterious. She has an elegantly furnished flat over a flower-shop.”

“A service flat?”

“No. One of the quiet kind, with a lift you work yourself. She only turns up occasionally, mostly in the evenings, spends a night or two and departs. Food ordered in from Fortnum and Mason’s. Bills paid promptly by note or cheque. Cleaning done by an elderly female who comes in about eleven, by which time Mrs. Forrest has usually gone out.”

“Doesn’t anybody ever see her?”

“Oh dear, yes! The people in the flat below and the girl at the flower-shop were able to give me quite a good description of her. Tall, over-dressed, musquash and those abbreviated sort of shoes with jewelled heels and hardly any uppers—you know the sort of thing. Heavily peroxided; strong aroma of origan wafted out upon the passer-by; powder too white for the fashion and mouth heavily obscured with sealing-wax red; eyebrows painted black to startle, not deceive; finger-nails a monument to Kraska—the pink variety.”

“I’d no idea you studied the Woman’s Page to such good purpose, Charles.”

“Drives a Renault Four-seater, dark green with tapestry doings. Garages just round the corner. I’ve seen the man, and he says the car was out on the night of the 27th. Went out at 11:30. Returned about 8 the next morning.”

“How much petrol had been used?”

“We worked that out. Just about enough for a run to Epping and back. What’s more, the charwoman says that there had been supper for two in the flat that night, and three bottles of champagne drunk. Also, there is a ham in the flat.”

“A Bradenham ham?”