A young woman is sent to a cult-like rehab facility called Sword & Cross to serve time for a crime she can't remember committing. Among the other residents, she encounters the enigmatic Daniel and exasperating but irresistible Cam, all of whom are under the watchful eye of the sinister chief doctor Howson, and devout twin sisters Miriam and Sophia. Luce must untangle the mystery of who she is and why she has a connection to Daniel that goes far back beyond their time in the institution
Sue works in a library. Daniel eats crisps and listens to Metallica. This was the summer Daniel was due to spend with his father and his father's new wife in Florida. But when they cancel his trip at the last minute, Sue and Daniel suddenly face the prospect of six long weeks together.