16岁的托比亚斯，盛夏时节再度被母亲抛掷于乡间祖父母家。衰老的屋宇里，失智的祖母喃喃自语，少年百无聊赖。直到他遇见了眼神忧郁的青年画家阿隆，孤独的心开始悸动。然而，渴望又害怕被爱的托比亚斯，总在靠近时选择逃离。当命运骤然降下残酷的考验，他能否挣脱自我厌弃的泥沼，抓住这束微弱的光，还是任由青春之花因自残枯萎？

14-year-old Thomas has just moved to Copenhagen with his mom. Thomas likes to draw, it's a way for him to escape from the pressure around him. In school he meets Mads and Emma. Mads likes Thomas' drawings, whereas Emma is romantically interested in Thomas and invites him home with her. Just before leaving, Thomas meets Emmas older brother, a young, emerging artist. The meeting changes something within him. Rumors start circulating about Emma and Thomas - and he doesn't deny them. Thomas can't understand his feelings, how to act in the new school or control the lies, he has created to be popular. "October Boy" is film about all the things that change us as people.