Justin crashes Jayne's Aqua Spin class to interrogate arson suspects. Billie is torn between her personal and professional life. Maisy uses a "spa day" to extract medical samples from Mimsy.
The lake community scrambles to prepare for the Boathouse Talent Show, including Billie and her birth mom Teesa. Justin struggles to mend bridges with Billie and build new ones with Opal while Maisy remains wary of his intentions.
The lake community comes together one last time for Tiltapalooza, the final blowout of the summer. Relationships will end, Tilts will be won, and the fate of the Lovejoy cottage and murder cabin will be decided.
Maisy and Justin are stranded on a floating dock until they come to an unorthodox agreement about the fate of the cottage, while Billie and Killian have weird day at the Quads' birthday party.
A surprise visit from her mother forces Billie to come up with a Justin-esque scheme. Justin and Riley are forced to play a happy couple in hopes of securing a new Boathouse. Maisy struggles to accept her mother's diagnosis is genuine.
When both of Billie's crushes arrive at the Murder Cabin, Billie enlists Justin in a manic game of keep-away. Maisy plans a celebrity talent show to remind the lake why it needs a new boathouse.
An opportunity arises for Justin to redeem himself when he discovers the fire may have been deliberately set. Billie's ideals are challenged by a nemesis and Maisy searches for evidence that her mother is lying about her imminent death.