Horatio battles the FBI and U.S. Marshals as he tries to uncover why a beautiful woman was murdered poolside at a ritzy hotel. Evidence suggests it was a professional hit, and the case becomes really puzzling when the feds take an interest. Elsewhere, Calleigh confronts her dad about his drinking problem.

Horatio and his crew investigate the deaths of two college students who were in Miami on spring break. The first is a teen girl found dead on a beach with her neck broken and human bite marks on her legs. The second is a young man found on the bottom of a motel swimming pool who apparently died before he hit the water.