Adrian Monk dislikes crowds and commotion. With its usual perverse sense, this show now sends him to a rock concert. The trouble starts when the captain’s son skips school to catch the concert. Monk is assigned to find him; he also finds a possible killer.
The Unit helps the U.N. capture a war criminal in Serbia. The man's wife is killed during the initial attack to bring him in and he seeks revenge. Back at home, Jonas learns that Molly lost their savings and confronts her about it, and Tiffy considers divorcing Mack after she reads a letter indicating that he has re-enlisted. Also, Kim learns some disturbing news about a fellow Unit member's wife.
Romance begins to bloom between Danny and Delinda, to their utmost surprise. But keeping the relationship tight-lipped proves difficult, particularly when Jillian (Cheryl Ladd) flies in Delinda's old college flame (Shawn Christian). Meanwhile, Casey (Dean Cain) organizes a paintball retreat for the department heads.
Katrina-related insurance claims are investigated by Brian Ross.