Olive Torres considers herself chronically unlucky, especially beside her identical twin sister Ami, whose life always falls into place. The pattern seems to flip at Ami's wedding, where nearly the entire reception is felled by food poisoning from the buffet -- everyone except Olive and Ethan Thomas, the groom's brother and the one man Olive cannot stand. With the newlyweds too sick to travel, their non-transferable, all-expenses-paid tropical honeymoon would go to waste, so Ami insists Olive take it. The catch: it is booked under the newlyweds' names, so Olive and Ethan must go together and pose as the married couple. Sworn enemies forced into close quarters, they agree to a fragile truce -- which grows more complicated when Olive runs into someone from her professional life and a small lie spirals, forcing them to fully commit to the loving-newlywed act in public. As the days pass, Olive begins to question whether her dislike of Ethan was ever the whole story. The novel pairs sharp banter with a warm, family-centered emotional core.