2019. Stella Parker has a loving husband, two happy children, and a beautiful house in Washington, DC. But when her neighbor Gwen shows up at her door, claiming to know things about her, Stella's forced to reckon with the dark secret upon which she's built her life. 1987. Julie Waits yearns for an escape from life with her mother, the terrible men she attracts, and the upheaval caused by their constant moves. But when her mother decides those relationships are over, the past becomes a forbidden subject Julie can never revisit. As Stella probes deeper into what brought Gwen to her door, the answer - and who Julie is to her - become increasingly, terrifyingly, clear.