"Never Trust a Thief!" by Robert Silverberg is a science fiction short story written in the late 1950s. The narrative revolves around themes of betrayal and the treacherous nature of accomplices in crime. It delves into the adventures of Kiley, a professional jewel thief, who finds himself in an ominous partnership with an alien named Thaklaru, who provides Kiley with extraordinary powers of hypnosis. The story follows Kiley as he initially revels in his newfound capabilities, successfully executing a jewel heist with the assistance of Thaklaru. However, as they prepare to divide the stolen treasures on the alien's home planet, Kiley learns that trust is a dangerous gamble. Thaklaru, despite appearing to be a supportive ally, reveals his true intentions to eliminate Kiley in order to keep their illicit activities a secret. In a chilling climax, Kiley faces his demise at the hands of Thaklaru, underscoring the stark warning of the title: in a world rife with deceit, even the closest partnerships can lead to fatal betrayal. (This is an automatically generated summary.)