The Castleford Conundrum is a 1932 detective novel by the British author Alfred Walter Stewart, published under his pseudonym J.J.

[3] It makes passing reference to one of the earlier stories Mystery at Lynden Sands.

When she is found shot dead on a chalet on the edge of her country estate, Inspector Westerham is called in to investigate.

He discovers the deceased had recently destroyed her first will and was in the process of replacing it with a second, favouring her brothers-in-law rather than her current husband for whom she had grown contemptuous.

However an appeal by the accused's daughter to Sir Clinton Driffield's friend Wendover brings them both on to the case.