In the heartwarming comedy-drama, a shy teenager named Duncan, portrayed by Liam James, embarks on a transformative summer vacation that promises to redefine his sense of self. Accompanied by his overbearing mother, played by Toni Collette, and her insufferable boyfriend, a condescending figure brought to life by Steve Carell, Duncan feels trapped in a world that stifles his emerging identity. However, everything changes when he stumbles upon a local water park run by the carefree and charismatic manager, Sam Rockwell.

As Duncan finds solace in this new environment, he begins to forge friendships with an eclectic group of characters, including the fun-loving Maya Rudolph and the witty Rob Corddry. These relationships help him to navigate the complexities of adolescence and family dynamics while providing an avenue for self-discovery. The film artfully balances humor and poignant moments, capturing the essence of growing up and finding one's voice amidst life’s challenges. With its relatable themes and an engaging ensemble cast, including Annasophia Robb and Allison Janney, this tale promises to resonate with anyone who has ever felt lost in the journey of life.