Mac is on the hunt for a sniper who is using nitroglycerin in his bullets to explode on impact, and the prime suspect was once a missing boy from one…

When a beloved tennis coach is nearly killed, Calleigh discovers a personal connection to the case.

In the spirit of Valentine’s Day, Meredith and Derek try to have a night to themselves when Lexie offers to watch Zola; Callie hands babysitting duties over to Mark so…