"An astounding and original thriller with a complex relationship between three women at its heart and an explosive conclusion." - B. A. Paris,New York Timesbestselling author ofBehind Closed Doors

The next gripping psychological thriller by the author ofHow I Lost You, Jenny Blackhurst's #1 international bestseller, about a psychiatrist and patient relationship that turns not only toxic... but deadly.

Karen, Eleanor, and Bea have been best friends since childhood. They know everything about each other's lives, or at least they think they do. Now in their thirties, though their lives are beginning to diverge: Eleanor is a young wife and mother who is struggling to cope with her many responsibilities; Bea is happy being single - or so she lets people think; and Karen is a psychiatrist who, despite the secrets in her past, considers herself the anchor of the group.

But when she takes on a new patient with issues she just can't quite put her finger on, she begins to realize she may have put her dearest friends in danger. Because her patient knows more about these three women than anyone outside their circle possible could. Or should...