It's the last day of senior year. Rowan Roth and Neil McNair, both overachievers, have been bitter rivals for all of high school. When Neil is named valedictorian, Rowan has only one chance at victory: Howl, a senior class game that takes them all over Seattle, a farewell tour of the city she loves. Learning that a group of seniors is out to get them, the two reluctantly decide to team up. They'll play until they are the last players left-- and then destroy each other.