Can eighteen things save a life? Olga Gay Worontzoff thinks her biggest problems are an awful name (after her grandmothers of course) and not attending prom with Conner, her best friend and secret crush since kindergarten. Then Conner is killed in a freak boating accident and Olga feels responsible. When she downs an entire bottle of pills to deal with the emotional pain, her parents force her into counseling. There, her therapist writes a prescription in the form of a life list titled 18 Things. Eighteen quests to complete the year of her eighteenth birthday. All she has to do is fire-walk, try out for the cheerleading squad, break a world record, and err . . . go on her first date. Good thing Nate, a new hottie in town, enters her life with perfect timing. He brings the fun factor to her list and helps her discover the beauty and strength inside herself, then complicates things by falling in love with her. But there's more to Olga’s quests than meets the eye and when her therapist reveals a terrifying secret, her world is shaken. There’s only one thing she knows for certain: her choices won’t just affect her future, but all eternity.

Lying is unbearable, betrayal is inevitable, and choosing which path to take is impossible. Olga Gay Worontzoff ended her senior year as an eighteen-year-old girl totally in love with Nate, enjoying their new romance and about to attend the university of her dreams. Now she’s spending her summer in the weird subculture of the Underworld, with charmingly witty and powerful angels, and problematic demons, trying to rescue Connor, the best friend and secret crush she was unable to save during a freak accident. But Nate has other things on his mind, mainly Grace. She’s their first assignment as joint spirit guides, and Olga’s feeling hurt and jealous. His mysterious behavior has Olga questioning everything she believed about him and now she must decide whether to stick to their plan, or follow her heart. Unfortunately, a series of mistakes threatens everyone around her and plants Olga in the center of cosmic events much larger than she ever imagined. Only one thing is certain: the chilling truths uncovered during her journey will leave no one untouched.