This book is a mystery novel written by Arthur Morrison. The protagonist of this novel is none other than the name of the title: Martin Hewitt, who was the first American detective to follow in the footsteps of Sherlock Holmes in England. He runs a successful private detective agency, relying on the help of a clerk and occasional assistants. With a friendly demeanor and strong ties to the police, Hewitt is often called in to solve cases when the authorities have hit a dead end. Unlike many detectives, he keeps his methods and deductions close to the chest, leading to surprising and jaw-dropping conclusions. Martin's cases are documented by his close friend and journalist, Mr. Brett.