After the death of her girlfriend, Felicity Morrow returns to Dalloway School for a second chance at senior year. Subject to pity and whispers, she retreats into her studies and her obsession with the school's dark and witchy past. Felicity's only distraction is Ellis Haley, a prodigy working on a novel about what drives a person to kill. Ellis recruits her to help plot the perfect hypothetical murder for her book, which she swears will banish the guilt and ghosts of Felicity's past. Their attraction and intense commitment to Ellis' plan grows - but not everyone will make it out alive.