Professor Nicky Welt utilizes his keen powers of deduction to resolve complex criminal cases through logic and observation. Nicky Welt, an English professor with a penchant for solving crimes, acts as the central figure in these short stories. He faces various mysteries that baffle local authorities, relying on his intellectual rigor to identify the truth hidden within seemingly mundane details. The narrative framework follows a classic detective structure where the protagonist dissects evidence to expose the underlying reality of each situation.

Readers frequently highlight the cleverness of the puzzles presented in these stories, noting that the professor's methods are both engaging and intellectually stimulating. Discussion often centers on the contrast between the professor's quiet, academic demeanor and the gravity of the crimes he solves. Critics often point to the economy of the prose, which allows the reader to focus entirely on the mechanics of the mystery. The collection is widely regarded as a staple for those who appreciate traditional detective fiction that prioritizes wit and observation over violence.