Greer Hendricks and Sarah Pekkanen are friends and the co-authors of four best-selling suspense thrillers. In addition to You Are Not Alone, they have co-written the novels The Wife Between Us (2018), An Anonymous Girl (2019), and The Golden Couple (2022). Their works are known for featuring strong female protagonists that interrogate the dark side of human nature and human relationships.

Although Sarah Pekkanen has co-written four novels with Greer Hendricks, she is also a best-selling solo author, known primarily for domestic thrillers that often probe the gap between appearances and reality. Originally trained as a journalist, Pekkanen’s first novel, The Opposite of Me, appeared in 2010, focusing on a fraught relationship between twin sisters. The Ever After (2018) examines a crumbling marriage and shares with You Are Not Alone a thematic interest in the gulf between appearances and reality.

Greer Hendricks also has a journalistic background. She holds a Master’s degree in journalism from Columbia University but has spent much of her career in publishing. She worked for nearly 20 years at Simon and Schuster, both as an editor and as a vice president. Hendricks has not published novels on her own, but she has written two popular short stories. “The Sublet” depicts a complex friendship that is not all that it seems to be. It shares with You Are Not Alone an interest in both female friendships and the perils of manipulative individuals. “A Show of Faith” also examines a fraught friendship, and each of its protagonists ultimately learns that there is much more to the other than meets the eye.

Pekkanen and Hendricks have written four novels together. The Wife Between Us (2018), a domestic thriller, examines the dark and twisted role of jealousy in marriage. An Anonymous Girl (2019) features a female protagonist who agrees to be a test subject for a psychological research project, soon finding herself at the center of a terrifying series of manipulations. The Golden Couple (2022) also showcases a fraught marriage and uses the fast-paced, suspenseful form of a domestic thriller to examine problematic behaviors in relationships.