A high schooler with a huge collection of video games is murdered and a three-year-old girl is shot and killed in her crib. Investigating the high-school case, the detectives are stymied by contradictory evidence, and by the presence of a weird suspect named Swirly (Josh Zuckerman), who lives with his even weirder mother. And while tackling the case of the dead three-year-old, Connie (Charlotte Ross) and Rita (Jacqueline Obradors) trace the gunfire to an engagement party on a lower floor. In off-the-job developments, John Jr. (Mark-Paul Gosselaar) tries to reach out to his taciturn dad (Joe Spano); Andy (Dennis Franz) and Connie may get together; and gay cop John (Bill Brochtrup) prepares to visit Africa with his new significant other. ~ Hal Erickson, Rovi