Seventeen-year-old Sage Evans' therapist mother has given her one rule: "Never fraternize with the patients. Keep a safe distance." But the summer Sage and her mom move into the Paige's garage apartment, all the rules change. Sage is drawn to the twins her mother is treating through a confusing psychic connection and a burning desire to know what left them so damaged. Elena takes pleasure in harming herself while healing others, and Ethan is stuck in time at the age of four, a terrified child whose ability to see others' pasts and futures comes at a painful price. Sage's deepening feelings for the twins complicates her romantic relationship with the dangerous fire-starter, Finn Mulcahy, whose past is intricately intertwined with the twins. As Sage uncovers the mysterious tragedies and the secret pain of each of her friends, she falls in love. And her own safe world begins to collapse when her relentless curiosity uncovers horrible damage her father has inflicted and her own complicity in his crimes. As Sage selfishly reaches out to her friends for comfort and connection, jealousies and guilt are aroused that spiral out of control, ending in a fire that destroys the Paige's garage apartment. Finding out who set the fire becomes the only thing that matters because until she does, Sage can't trust anyone, and no one will trust her.