The Wedding Guest by Jonathan Kellerman follows psychologist Alex Delaware and his friend, detective Milo Sturgis, as they investigate a shocking murder that disrupts a lavish wedding celebration. The victim, a beautiful young woman, is found dead shortly after the ceremony, and the circumstances surrounding her death are both puzzling and disturbing. As Alex and Milo dig deeper, they uncover a web of secrets, lies, and hidden motives among the guests. With each revelation, the investigation takes unexpected turns, challenging their understanding of the people involved. Kellerman weaves a gripping narrative filled with psychological depth and intricate plotting, keeping readers on edge.