Benoit Blanc and his husband are invited to a high-profile wedding in London. The groom is the son of their dear friend who passed recently, and they can't miss the opportunity to support him and his lovely bride. However, with all of the young couple's eccentric family and friends coming together for the occasion, chaos ensues. The charming best man's young girlfriend is murdered, and the prime suspects are her boyfriend and the maid of honor (who has had her eye on the best man all weekend). But who really killed her?