He asked for specifically, Mannix is about to decline the offer to work on a divorce case, that is until he learns the client is Gloria Farnsworth née Newman, his serious girlfriend until she married wealthy Victor Farnsworth three years ago. In inferring she wants to resume a relationship with Mannix after all is said and done, Gloria wants a quiet but in her words "dirty" divorce in her directive to Mannix being to dig up any dirt on her soon to be former husband, she suspecting there having been marital infidelity on his part. Shortly after starting work on the case, Mannix discovers that in the process he has been set up to take a fall in being implicated in a murder, the police indeed naming him publicly as the only suspect and thus is a wanted man. On the run with Lew's help, Mannix necessarily changes his focus to finding out who the real murderer is i.e. who set him up and why, the most obvious candidate being Gloria herself.
—Huggo