Serangoon Road - Season 1

When the Cheng Detective Agency is hired by the CIA to investigate the murder of a US sailor, Sam is asked to help out as a favour to the widowed owner, Patricia. But as Sam tries to save the life of an innocent man, he is forced to revisit memories of killing a childhood friend during the second World war.

Forced to flee to China during the Japanese occupation, Feng returns to Singapore looking for her husband whom she has not seen since the war. No one is certain that he was still alive, yet Sam and Patricia, both of whom know what it is like to lose loved ones agree to help solve this mystery of Feng's husband. The case then gets more convoluted when Feng is mysteriously poisoned.

Riots in the streets have put the whole city on edge. When Patricia attempts to make a delivery to a client, she is attacked and her photographs are stolen. Sam's efforts to help her ultimately lead him to a mysterious client, political dissidents, and MI6 activities.

Maxwell Black of West Pacific Exports hires the agency to investigate rumors that one of his employees is on the take-specifically Frank Simpson, Claire's husband. Meanwhile, Kay Song presses Sam to find the traitor in the Red Dragon's ranks.

While visiting a village hospital sponsored by West Pacific Exports, Claire discovers that its malaria medicine is ineffective. As Sam tracks down those responsible for the drug tampering, Claire learns a harsh lesson in political realities.

When a newborn baby is left on the doorstep of the Cheng Detective Agency, Patricia and Sam try to figure out what they are to do with him. Patricia also receives a package containing Winston's fob watch, which was believed to be stolen when he was murdered. Meanwhile, Su Ling confronts her fear and desire over her relationship with Conrad, and Kang strikes a deal with the Devil.

Caught transporting explosives, Kang will face the gallows if Sam is unable to track down the truth about Lim Chee Kit, a leading trade unionist whose organization is suspected of being involved in a recent bombing. The case is further convoluted because Chee Kit's brother, James, is a well-connected businessman with political aspirations. Although he disagrees with Chee Kit's politics, James hires Sam and the agency to find and help his estranged brother before the police arrest him.

Sam agrees to investigate on the disappearance of two Australian girls from a freighter at the Singapore harbour. The investigation leads him into Singapore's criminal underworld and Sam gets involved in a dangerous game that could cost the girls their lives. Meanwhile, Patricia is confronted by a painful truth of Winston's past. Miller forces Conrad into going double, while Sam and Claire's relationship gets pushed to a breaking point.

When Sam goes out on a limb for an ex-World War II Australian soldier who had been accused of murder, no one understands why he is so adamant on the man's innocence - least of all Macca, who had been in love with the girl who was murdered. Either gaol the accused man for life or Sam has just made a very big mistake about his hero and friend.

Sam is on the brink of discovering the truth behind the murder of Patricia's husband - a murder that involves a secret deal between James Lim, Kay Song and the CIA. But is he obsessed with solving this case in order to avoid facing the fact that he might lose Claire forever?