Hillary starts out the summer after sophomore year on a high note— meeting a seemingly perfect guy. By the time the beginning of the school year rolls around, they meet again, except this time he’s introduced under a new title: her little sister’s new boyfriend. A simple jealousy would’ve been fine for Hillary, compared to the intensity of another boy and sibling rivalry so twisted and mysterious that she’s struggling to comprehend it all. But after a night that changes her life, she’ll have to relive everything, deal with the repercussions, and try to adjust to a life without all the things she thought she would have forever.