Two White Mice Under a Riding Whip

Another of E.C.R. Lorac's interesting little mysteries, or even better, thrillers.

Basil Romaine has come to consult with John Lathman, a psychologist, about a client who has been rendered next to senseless because of the kidnapping of her 8-year old son Derrick.

Can the two of them fathom the picture she gave them, and get her son back?

Librarian's note: this is one of 17 stories in Bodies from the Library #4 (2021). It first came out in 1938 as one of 6 in the Sunday Dispatch as a response to a challenge to create a short mystery using a tool as a theme. In this case it was two mice and a riding whip.