Sherlock Holmes, the creation of Sir Arthur Conan Doyle, is renowned for his sharp intellect, keen observation skills, and his signature catchphrase.

Hercule Poirot, the eccentric Belgian detective created by Agatha Christie, is famous for his meticulous methods and his distinctive mustache.

Miss Marple, the elderly spinster detective in Agatha Christie's novels, uses her sharp wit and understanding of human behavior to solve mysteries.

Jessica Fletcher, the protagonist of the "Murder, She Wrote" series, is a mystery writer who often finds herself solving real-life crimes in her small town.

Sherlock Holmes, the iconic detective created by Sir Arthur Conan Doyle, is often depicted wearing a deerstalker hat, along with his Inverness cape.

Nancy Drew, the teenage detective created by Carolyn Keene, is known for her resourcefulness and her ability to solve mysteries with the help of her friends.

Sam Spade, the hard-boiled detective created by Dashiell Hammett, is known for his cynical attitude and his willingness to take on dangerous cases.

The Hardy Boys, Frank and Joe, are two teenage brothers who solve mysteries together, often getting involved in dangerous situations.

Joe Friday, the police detective from the TV series "Dragnet," is known for his straightforward approach and his signature catchphrase.

The Boxcar Children, Henry, Jessie, Violet, and Benny, are four orphaned siblings who solve mysteries while living in an abandoned boxcar.

Professor Challenger, the eccentric scientist created by Sir Arthur Conan Doyle, is known for his outlandish theories and his catchphrase.

Harriet the Spy, the young protagonist of the series by Louise Fitzhugh, keeps a secret notebook to record her observations of her classmates and neighbors.

Jack Reacher, the former military police officer created by Lee Child, is known for his exceptional combat skills and his ability to disappear into any environment.

The Three Investigators, Jupiter Jones, Pete Crenshaw, and Bob Andrews, are three boys who form a detective agency to solve mysteries in their town.

Arsène Lupin, the gentleman thief created by Maurice Leblanc, is known for his intelligence, his charm, and his ability to outwit the police.