What more likely than Jimson's arrival with a grand piano (say, at Padwick), and his residence in a houseboat alone with the unfinished score of Orange Pekoe?
His subsequent disappearance, leaving nothing behind but an empty piano case, it might be more difficult to account for.

And yet even that was susceptible of explanation.

For, suppose Jimson had gone mad over a fugal passage, and had thereupon destroyed the accomplice of his infamy, and plunged into the welcome river?
What end, on the whole, more probable for a modern musician?
'By Jove, I'll do it,' cried Gideon.

'Jimson is the boy!'.