Two rival travel writers. One honeymoon guide. Zero chance of keeping it professional. Ellie Hart writes about love for a living — ever since her fiancé left her for her wedding planner. Daniel Reyes writes about everywhere except the place his heart broke. When their shared publisher orders them to co-author the perfect honeymoon guide across Italy, the two enemies board the same train with one rule: keep it professional. Ten cities. One itinerary. No privacy. Between a three-pizzeria showdown in Naples, a dawn gondola in Venice, and a marketing stunt that demands they fake-date for the cameras, the rule doesn't stand a chance. Funny, warm, and quietly heartbreaking, The Honeymoon Handbook is an enemies-to-lovers romantic comedy about writing the truth — and finding it.