"All right, what's your theory?"
Timothy was frowning. "I haven't really got one. The whole thing seems to hinge on the first murder, and I haven't a clue who did that. There were five people who could have killed Seaton-Carew: Mrs. Haddington, Poulton, Butterwick, Beulah, and me. You can rule Beulah and me out, and you can also rule out Mrs. Haddington. I thought at one moment that things were pointing her way. No real reason, but what Beulah told me about that wretched coil of wire made it look slightly fishy. Well, that theory seems to have ended in a pretty nasty blind alley. We're left with Poulton and Butterwick - and, of the two, Butterwick's my fancy for the first murder, and Poulton for the second. And that combination doesn't add up, look at it how you may!"
"Hold on a minute! Didn't you tell me that the doctor's movements weren't entirely accounted for that evening?"
"No, hang it all, Jim, you must draw the line somewhere! Do you see a fashionable physician strangling a man in the middle of a Bridge-party?"
"Why not? What if Seaton-Carew was a danger to him?"
"Blackmailing him, do you mean? More likely to have slipped something lethal into his drink, if he wanted to get rid of him!"
"Not at all," said Jim. "Poison would have made him instantly suspect!"
"You win that point," admitted Timothy. "Now tell me why he murdered Mrs. Haddington!"
"I haven't yet worked that one out," confessed Jim.
"And while you are working it out, work out how he got into the house without anyone's knowing it!"