Amelia Collins is by definition successful. She would even go so far as to say successfully single. But not according to her family, and she's tired of the constant questions about her nonexistent dating life. When an invitation to yet another family wedding arrives, she decides to get everyone off her back once and for all by finding someone—anyone—to pose as her date. After a chance encounter with Reginald Cleaves, Amelia decides he's perfect for her purposes.

Scarlett Vandermeer is swimming upstream. A Junior at Stanford and a student-athlete who specializes in platform diving, Scarlett prefers to keep her head down, concentrating on getting into med school and on recovering from the injury. She has no time for relationships. Swim captain, world champion, all-around aquatics golden boy Lukas Blomqvist thrives on discipline. It’s how he wins gold medals and breaks records: complete focus, with every stroke. On the surface, Lukas and Scarlett have nothing in common. Until a well-guarded secret slips out, and everything changes.

Emily Walker hates having her carefully crafted world disrupted by anyone, most of all her legendary nemesis, Jack Bennett. He’s the opposite of the wonderful heroes she dreams up in her double life as a romance writer, which is why Emily was perfectly happy when Jack left Rome, Kentucky, mid-school year with his fiancée. The last thing Emily saw coming was Jack’s return at the start of the summer after calling off the wedding and ending his relationship, but he’s here to stay—as her colleague and her neighbor.

My father called them messengers. He once told me they walked among us and that somewhere in this dark and godless city, there shined a faint sliver of hope. I had only to look for the signs. Well, I’ve spent my whole life investigating the inexplicable and all I've found are the unsettling vestiges of iniquity—the evidence of another world shrouded by the obscure. Purgatory to some, where depravity hides in shadows, and girls like me are little more than delicious bites of temptation. Others call it Nightshade.

Every summer, superstar surgeon Whitney Aldritch crashes weddings with her best friend. The first one was an accident, though after a decade of dropping in uninvited, they’re masters of their craft. They keep the rules simple, and they never go to bed alone.