Steve Carell and Timothée Chalamet star in this American biographical drama based on the memoirs of David and Nic Sheff (Carell and Chalamet/Jack Dylan Grazer/Zachary Rifkin/Kue Lawrence). The film follows David as he tries to save his son Nic from a crippling drug addiction that threatens to destroy his life. When he first realises Nic has been using drugs David sends him to a rehab facility for immediate treatment, beginning a long cycle of relapse and rehabilitation, while David relentlessly searches for solutions to save his son and realises his attempts are ultimately doomed to fail.