The Long Summer follows Rachel Fletcher as she returns to her childhood home to care for her ailing mother and manage strained family relationships. Her life takes a darker turn after a fatal car accident involving an unknown woman. As Rachel tries to make sense of the incident, she finds herself haunted-by her guilt, her past, and possibly something more sinister lurking in the shadows. With family secrets unraveling and her own mind unraveling, Rachel must confront the truth about what's really happening in her small town before it consumes her.