"N or M?" is an exciting detective story by the famous English writer Agatha Christie. In this book, the popular if not the most famous lady detective Miss Marple goes on vacation to a small resort town, but quickly finds herself involved in a complex investigation of betrayal, espionage and mysterious disappearances. A criminal conspirator who hides under one of two mysterious aliases "H" or "M" poses a huge challenge to Miss Marple's deductive powers. In this book, the author builds a tense atmosphere of suspicion among the characters and weaves a tangled web of unpredictable events. Readers will be excited by the unexpected plot twists, the shocking ending, and of course, Miss Marple's unparalleled analytical skills. "N or M?" is a classic crime story that keeps you in suspense until the last page.