Brent and Hank rediscover their old tree house, only to find that it's been taken over by a new group of kids. Deciding that they want it back, Brent and Hank sink to new lows in their fight to reclaim a piece of their lost childhood. Elsewhere, Wanda escapes police custody; Lacey takes up a new sport; and Oscar has problems in affairs of the heart.

In the final 30 minutes before Brent turns 40, Wanda tries to pull off a fireworks display for the occasion that goes terribly wrong. Lacey and Emma disagree over just who should be baking Brent's birthday cake, and Brent is dismayed to discover that his special bottle of scotch has gone missing.