Tilly Gardner (India Eisley India Eisley)'s parents were killed in a plane crash, which left her depressed. The emergence of South Tuckett's mechanic Nico (KJ Apa K.J. Apa) changed all that and made Tilly fall in love with her. But as she got along with Nico, Tilly gradually realized that his identity didn't seem simple and was inextricably linked to the crash that killed Tilly's parents. On the other hand. Matters are further complicated by the intervention of FBI agent Cantrell (James Remar James Remar), who is determined to avenge Tilly's father. On Nantucket, a crisis seems to be on the horizon.