A woman, Heather Sinclaire, is found dead in her apartment by her roommate/lover Marci Fuller; she was killed by a blow to the head from a baseball bat. Lance and Lorenzo investigate to find that Heather and Marci worked for a service run by Atticus Dunn, called Red Flag. This service sends women on missions to test the fidelity of married or soon-to-be-married men. The two Sam's get a list of Heather's past assignments and start investigating them. Soon, they come across an open case that involved a father hiring Atticus to test the fidelity of his daughter Shannon's fiancee, Jonathan Sharp. Chris and Rita think Heather may have gotten the evidence to close the case, and was bribing Jonathan with it. Meanwhile, Eric tells Rita that he's thinking of moving to Palm Beach, and that he's falling in love with her.