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While diving for sunken treasure off the Miami coast, private investigator Tony Rome discovers the nude corpse of a blonde whose feet have been encased in cement. Following an autopsy, which reveals that the woman was murdered with a knife, a huge ex-convict, Gronsky, hires Tony to find out if the blonde is his missing girl friend, go-go dancer Sandra Lomax. Sandra's roommate, Maria Baretto, informs Tony that Sandra was last seen at a party given by heiress Kit Forrest, but Kit, an alcoholic, claims that she was too drunk at the party to remember anything. Kit's neighbor, ex-Mafia chief Al Mungar, warns Tony to leave Kit alone. Soon afterwards, Maria is murdered, and two of Mungar's hoods make an attempt on Gronsky's life. Unperturbed, Tony continues with his sleuthing. A sketch drawn by artist Arnie Sherwin proves that the dead woman is indeed Sandra, and Tony eventually learns that Kit and Sandra clashed over Mungar's son, Paul. Maria's homosexual boss, Danny Yale, is also found murdered, and the evidence indicates that Tony is the killer. Escaping from his old friendly enemy, Police Lieutenant Santini, Tony takes refuge in Kit's home. When Kit confesses that she awoke after her party and found a paperknife in her hand and Sandra's dead body at her feet, Tony suspects that Kit may also be the victim of a frameup. After forcing Gronsky to admit that he and Paul were partners in stealing some of the senior Mungar's robbery proceeds, Tony realizes that Paul killed Sandra to get the money Gronsky had given her. Knowing that Kit's life is now in danger, Tony and Gronsky race to the Mungar residence and save her from being knifed by Paul. With the case resolved, Tony calls in Lieutenant Santini and leaves with Kit to search for sunken treasure.