Inspector Marco Books in Order

A mutilated body in a Cardiff river leads Inspector John Marco into killings within the city's Polish community. Investigating trafficking networks and international criminal connections takes him to Poland, where personal entanglement and a fresh murder threaten to derail his search.

A well-connected man is murdered outside Cardiff City's football stadium, leaving Inspector John Marco to investigate links with hooligan gangs and organized crime. Facing pressure to surrender the case, he races to establish whether powerful people are protecting the truth.

A wealthy banker is murdered with a message condemning his greed, apparently pointing toward political revenge. Inspector John Marco doubts the obvious explanation, and another executive's death reveals a more complicated threat involving the city's privileged families and a kidnapped colleague.

As Cardiff emerges from lockdown, the murder of a sexual predator is followed by another mutilated body. Inspector Marco suspects a single killer, but disagreements with his superiors and a revenge motive complicate the effort to identify the next target.

A homeless man's body is found beneath a church steeple during a severe Cardiff winter, and Inspector Marco resists pressure to close the inquiry quickly. Another killing and disappearing witnesses draw him into a difficult search within the city's vulnerable community.

A professional killing leads Inspector Marco toward a notorious gangster with a convincing motive and an apparent alibi behind bars. Suspecting corruption, he revisits old cases, but threats against his family make proving who ordered the murder increasingly urgent.