The Immoral Three

Three sexy women, raised separately as orphans, are summoned to a funeral, where they learn that they are in fact sisters and that the dead woman was their mother. The latter had been a secret agent, the notorious Double Agent 73 (a reference to Wishman's earlier "Chesty Morgan" flicks), who had been murdered in the line of duty. She had used her feminine wiles to seduce and betray enemy agents, but was rather careless in executing this modus operandi. The unwanted daughters being one of the job hazards. The executor of the will tells the girls that they can inherit a cool million each as long as they can track down their mother's killer within one calendar year.