The Riddle That Never Was is an adventure from one of Enid Blyton's lesser-known series, likely the Young Adventurers collection. The plot centers on a puzzle or riddle that the young protagonists must solve, which appears to be a red herring or a confusion—hence the "never was" aspect. The children’s investigation leads them to a genuine mystery hidden beneath the misleading puzzle, requiring their logic and perseverance to uncover the real secret.