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"Throughout the years both Rowan and Neil have been at competition with one another on everything from who has the best ideas for school functions to which one will be their graduating class's valedictorian. However, in the twenty-four hours left they have as high school students, the two learn they share something much deeper than a rivalry"--
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. -- adapted from jacket