“I never suspected it at all,” lamented Tuppence.  “I’ve always thought I was so much cleverer than Tommy—­but he’s undoubtedly scored over me handsomely.”

Julius agreed.

“Tommy’s been the goods this trip!  And, instead of sitting there as dumb as a fish, let him banish his blushes, and tell us all about it.”

“Hear! hear!”

“There’s nothing to tell,” said Tommy, acutely uncomfortable.  “I was an awful mug—­right up to the time I found that photograph of Annette, and realized that she was Jane Finn.  Then I remembered how persistently she had shouted out that word ’Marguerite’—­and I thought of the pictures, and—­well, that’s that.  Then of course I went over the whole thing to see where I’d made an ass of myself.”

“Go on,” said Mr. Carter, as Tommy showed signs of taking refuge in silence once more.

“That business about Mrs. Vandemeyer had worried me when Julius told me about it.  On the face of it, it seemed that he or Sir James must have done the trick.  But I didn’t know which.  Finding that photograph in the drawer, after that story of how it had been got from him by Inspector Brown, made me suspect Julius.  Then I remembered that it was Sir James who had discovered the false Jane Finn.  In the end, I couldn’t make up my mind—­and just decided to take no chances either way.  I left a note for Julius, in case he was Mr. Brown, saying I was off to the Argentine, and I dropped Sir James’s letter with the offer of the job by the desk so that he would see it was a genuine stunt.  Then I wrote my letter to Mr. Carter and rang up Sir James.  Taking him into my confidence would be the best thing either way, so I told him everything except where I believed the papers to be hidden.  The way he helped me to get on the track of Tuppence and Annette almost disarmed me, but not quite.  I kept my mind open between the two of them.  And then I got a bogus note from Tuppence—­and I knew!”

“But how?”

Tommy took the note in question from his pocket and passed it round the table.

“It’s her handwriting all right, but I knew it wasn’t from her because of the signature.  She’d never spell her name ‘Twopence,’ but anyone who’d never seen it written might quite easily do so.  Julius had seen it—­he showed me a note of hers to him once—­but sir James hadn’t!  After that everything was plain sailing.  I sent off Albert post-haste to Mr. Carter.  I pretended to go away, but doubled back again.  When Julius came bursting up in his car, I felt it wasn’t part of Mr. Brown’s plan—­and that there would probably be trouble.  Unless Sir James was actually caught in the act, so to speak, I knew Mr. Carter would never believe it of him on my bare word——­”

“I didn’t,” interposed Mr. Carter ruefully.