A deadly new form of heroin hits the streets of Santa Monica, sending the Bike Patrol into overtime as all hell breaks loose. During the investigation, T.C. falls under the seductive spell of an undercover DEA agent who's investigating one of the drug distributors but has become an addict herself.

Victor is ordered to attend requalifying training on the bike, and much to his horror, his instructor is HANS REY, a former instructor who made his life miserable the first time around. The two engage in a one-upmanship contest, judged by Chris.

The squad investigates the ""Letterhead Beatings"" in which several people have been assaulted, tied to their beds, and the first letter of their last names is carved into their foreheads. Palermo is certain there is a message here, but his inability to solve it in time to prevent further victims compounds his burn-out. When the letters add up to spell A-L-E-R-M-O, the solution appears. Palermo realizes the attacks are personal.

Chris and T.C. discover she's pregnant. T.C. proposes marriage, but Chris refuses to ""get married at the end of a shotgun."" Each fantasizes about impending parenthood, but just as they're settling into the idea, they learn that Chris is not pregnant after all.

Palermo hosts the daughter of his high school sweetheart, a young aspiring actress. A night of dinner and wine lead to lovemaking... and serious morning-after regrets from Palermo, who is already suffering from a mid-life crisis. This and the Letterhead Beatings make him question his current path in life. A