Mark, Steve, et al, investigate a string of the so-called ""Casanova"" murders. Dr. Sloan loses his detached perspective when the killer begins calling Mark.

Mark, Steve, et al, investigate a string of the so-called ""Casanova"" murders. Dr. Sloan loses his detached perspective when the killer begins calling Mark.

Mark's daughter returns after eight years, leaving an abusive husband who later turns up dead.