The Expressman and the Detective

"All history proves that no one can hug a secret to his breast and live (...) This is especially noticeable in persons who have committed criminal acts." When a trusted employee is suspected of stealing from the Adams Express Company in Alabama, the organization reaches out to the Pinkertons, the world's first private detective agency. Recounting true events, `The Expressman and the Detective' (1874) tells a fascinating and suspenseful story of an investigation in which all that can prove a person's guilt is a confession.
Allan Pinkerton, the founder of the agency, assigned agents to shadow the suspect, others to gain his trust and he was among the first to hire a female detective. The London Times famously called him "a man at once deeply admirable and quite obnoxious."