Meredith, rattled by the latest events, tries to figure out what to do about Derek. Meanwhile, Owen is shocked when his mother is admitted to the hospital.
Rigsby and Van Pelt go undercover, posing as a couple with relationship problems in order to investigate the death of a woman who received advice from a radio love doctor.
Bonnie has success creating a line of mocktails for Adam's bar; Jill finds herself attracted to Bonnie's therapist.
Three soldiers are gunned down outside a Los Angeles club two days after returning home from duty in Afghanistan. Brenda's investigation puts her on a collision course with Major Edward Dorset, a military liaison officer.
Cameron wanders the streets suffering disturbing flashbacks, and Agent Ellison considers Catherine Weaver's offer of work.