Ron Nyman

Peggy is kidnapped under orders of a crime boss to force Mannix to find an undercover man in his organization, whom he intends to have killed.

Joe Mannix goes undercover by joining a New Orleans mob to learn the identity of another member of the organization who wants to turn state's evidence against the head mobster, Lytell.

Joe Mannix is participating in an auto race when he suddenly begins to experience hallucinations. The resulting crash lands him in a private hospital, where the delusions and paranoia continue.

Tom Fortune, the rising young scion of a mobster family, tries to hire Mannix to shadow his wife, whom he suspects of being unfaithful, when Fortune is gunned down.

Fellow private investigator Charlie Frome is killed by a hit-and-run driver, apparently while working on a case, and Joe Mannix decides to see if he can determine why Frome was murdered.

Two crop-dusting pilots who worked for orange grower Clint Carpenter have vanished without a trace. Joe Mannix is asked by his former military buddy, Dave Winters, who runs the crop-dusting service, to help solve the mystery of their disappearance.