Every day, Arthur looked at the old photographs inside his private detective office and remembered his long career in law enforcement. He worked for thirty years solving the most dangerous and complex cases in the metropolitan area. His job required intense cooperation with the official district prosecutor to put criminals behind bars safely. During his life, Arthur completed many difficult investigations about financial crimes, white-collar fraud, and document forgery. He also captured violent bank thieves after a high-stakes robbery downtown. However, his most challenging cases always involved finding a cruel murderer or tracking a dangerous serial killer in the dark. Arthur interviewed hundreds of dangerous suspects and searched every crime scene carefully to collect small pieces of evidence. He retired last winter, but his excellent work helped the local police protect thousands of innocent citizens across the city.