Strait-laced go-getter Roger hopes to propose to his dream girl during a weekend getaway at her family's lake house, but his eager-to-be-best-buds potential brother-in-law might accidentally wreck his plans.

Roger (Taran Killam), a strait-laced politician, has big plans to propose to his dream girl (Gillian Jacobs) at her family's lake house. But everything goes awry when he meets his potential brother-in-law Todd (Bobby Moynihan): a full-time camp counselor with a heart of gold and a wild sense of fun, pining to be Roger's best friend, and ultimately catapulting him into a series of unfortunate events. As Roger tries to take a stand amidst outrageous fishing excursions, propulsive water jetpacks, and American-history-themed musicals, he realizes that being a part of a new family might be more difficult than he'd thought.