The Lady in Cement
by Anthony Rome, pseudonym of author Marvin Albert
It was also made into a movie in 1968 starring Frank Sinatra and Raquel Welch:
"While diving off the Miami coast seeking one of the eleven fabled Spanish Galleons sunk in 1591, private investigator Tony Rome discovers a dead blonde, her feet encased in cement, at the bottom of the ocean.Rome reports this to Lieutenant Dave Santini and thinks little more of the incident until man-mountain Waldo Gronski hires him to find a missing woman, Sandra Lomax. Gronski has little in the way of affluence, so allows Rome to pawn his ring to retain his services.
After investigating the local hot-spots and picking up on a few names, Rome soon comes across Kit Forrester, whose party Sandra Lomax was supposed to have attended. Rome’s talking to Forrester raises the ire of racketeer Al Mungar, a supposedly reformed gangster who looks after Kit’s interests.
Rome, thinking there may be a connection between Lomax, Forrester and Mungar, starts probing into their backgrounds and begins a romantic relationship with Kit. With both cops and crooks chasing him and the omnipresent Gronski breathing down his neck, Rome finds himself deep in a case that provides few answers. "