In a small American town, a high school teacher launches an ambitious project for his students: instead of paying back those who do them a favor, they must help three more people, who in turn will do the same for three others. Trevor, an idealistic young man, turns this idea into his personal mission after receiving an act of kindness from a stranger. With his heart full of hope and a deep desire to change the world, Trevor decides to put his plan into action.
As Trevor carries out his project, he encounters challenges within his own family. His mother struggles with alcoholism, and his father, whom he barely knows, is absent. Despite these obstacles, Trevor's determination begins to create effects in his community: acts of generosity flourish and many lives change for the better. However, the pressure of his mission and the inexperience of youth cause Trevor to face his own doubts and fears.
Through an emotional journey, the story serves as a powerful reminder that kindness can be contagious and how a single selfless act can create a lasting impact on the lives of others. As Trevor tries to make the world a better place, he discovers that the most significant changes often come from the most unexpected places.