Burned by a recent breakup, a woman finds joy baby-sitting for a friend in need and contemplates a new kind of domestic arrangement.

The creative department has a wild, drug-influenced weekend as they work on the Chevy account, Don has trouble letting go of Sylvia, and Sally walks in on an unwelcome intruder.

While Don continues his affair with Sylvia, Pete’s latest infidelity threatens his marriage. Meanwhile, Peggy’s icy relationship with her new staff continues, but she also gets an unlikely tip on…