Greg receives a disturbing call, Abby's been shot and Kathy is dead. The investigation puts a strain on Greg's relationship with Abby as he must ask the hard questions about what happened. Eventually Abby points to an obsessive bitter ex-lover as the mastermind behind the break-in. On the other pregnancy front, Gina develops complications that will take her off the job for a few weeks. A young woman's charred body, complete with a bullet wound, is found in an abandoned vehicle; Bobby, Diane and Andy investigate. They miss a chance at getting their prime suspect when the night watch falls asleep while on their stakeout of the suspect's home. When he is apprehended, the suspect claims it was an "accident."