Joe Mannix refers four cases to down-on-his-luck fellow private eye Jerry Henderson. But when Henderson is murdered, Mannix suspects that it was because of one of the four cases he referred -- an extortion case, a divorce involving infidelity, a drug overdose victim's father, and a man being pressured by a loan shark. Feeling responsible for Henderson's death, Mannix decides to look into each case himself to find out whether one of them resulted in his friend's death.
—aldanoli