A mild-mannered librarian suspects her husband could be a serial killer in this shocking psychological thriller - perfect for fans of Not a Happy Family by Shari Lapena and Keep It in the Family John Marrs.

FROM THE SUNDAY TIMES BESTSELLING AUTHOR OF THE KIND WORTH KILLING ''A killer read with twist after twist!'' JANICE HALLETT ''A typically shape-shifting psychological thriller.'' THE TIMES ''So many great twists and a truly chilling villain . . . Swanson''s best one yet.'' MARK EDWARDS ''The talented Mr Swanson does it again.'' SUNDAY INDEPENDENT After an unexpected, whirlwind romance, quiet librarian Martha married Alan. But when she thinks she sees his mask slip, she starts to fear that the conferences he travels the country to attend might be a cover for something far more sinister. As she secretly starts to map his movements she unearths a string of dead women, but could these two things really be linked? Unsure of her own instincts, Martha turns to an old friend, Lily Kintner, who once helped her escape a toxic relationship in grad school. But what Martha doesn''t know is that Lily has a dark side of her own . . . ''A clever, ingenious, edge-of-your-seat thriller.'' LIV CONSTANTINE ''The stakes are high, the body count is higher, and yet I would still follow Lily anywhere.'' STACY WILLINGHAM ''Menacing and exciting [...] It makes for a riveting entertainment.'' SUNDAY INDEPENDENT ''Clever, scary, endearing and plotted like clockwork'' CRIME TIME