Celeste Morgan wakes from a three-year coma to discover her husband has married her former best friend—and that her twin children are dead. But when she's discharged from the psychiatric facility where she's been declared mentally incompetent, she doesn't return to her shattered life. Instead, she wakes twenty years in the past, back in her college dorm room with an engagement ring on her finger and a second chance she never asked for. Her best friend Simone has already sent the first text, and Celeste knows exactly how this friendship will end: in fire, manipulation, and the loss of everything she loves. Now she has three days to rewrite her future—if she can figure out which memories are real, why her phone is receiving calls from the wrong timeline, and whether the woman who destroyed her life once has somehow followed her into the past.