"I Know What You Did Last Wednesday" by Anthony Horowitz is the thrilling fourth book in the Diamond Brothers series, offering a blend of mystery, humor, and suspense. The story follows the Diamond brothers—Tim, a well-meaning but clueless private detective, and Nick, his clever and resourceful younger brother. When a seemingly routine case takes a dark turn, the brothers find themselves entangled in a web of intrigue and danger.

The adventure begins when Tim and Nick are hired by a seemingly harmless client who wants them to investigate a mundane issue. However, things quickly spiral out of control when they discover their client is involved in a high-stakes conspiracy. As they dig deeper, they uncover a plot involving stolen art, dangerous criminals, and a string of puzzling events.

The book is packed with witty dialogue, clever twists, and suspenseful moments, showcasing Horowitz’s knack for creating engaging and humorous mysteries. Tim’s comedic blunders contrast sharply with Nick’s sharp intellect, making their dynamic entertaining and their adventure all the more gripping. "I Know What You Did Last Wednesday" delivers a captivating story with plenty of action and laughs, ensuring an enjoyable read for fans of detective fiction.