DI Matt Barnes Books in Order

The DI Matt Barnes books are hard-edged police thrillers set mainly in Greater London. They follow Matt Barnes as he works cases involving gangland figures, kidnappers, sexual predators, and repeat killers. The stories move quickly, but they also keep an eye on what the work costs the people doing it.

Matt begins the series as a Detective Inspector in A Reason To Kill. He and his team are guarding a key witness due to testify against gangland boss Frank Santini when a contract killer attacks the safe house. Matt is the only survivor, badly wounded and suddenly caught in a case that is no longer only professional.

That attack changes everything.

Criminal psychologist Dr. Beth Holder is brought in to help build a profile of the killer, Gary Noon. Beth becomes both a trusted partner in the investigation and an important part of Matt's personal life. Their relationship continues through the series, alongside the practical strain of Matt's all-consuming work.

Each book brings a fresh investigation. In Lethal Intent, the abduction of a senior officer's daughter points to a killer driven by revenge. A Need To Kill follows the murder of a high-end sex worker and the dangerous information missing from her address book. Chosen To Kill forces Matt's team to manage two separate, escalating murder investigations at once.

The later books keep widening Matt's responsibilities. He rises to Detective Chief Inspector and works with the Special Crimes Unit, a squad built to deal with the most serious and difficult cases. The investigations often involve little forensic evidence, a killer who has planned ahead, and a shrinking window to protect the next possible victim.

These aren't cozy mysteries. The violence can be grim, and the criminals are often seen as calculating, cruel, and persistent. But the series is anchored by a straightforward question: can Matt and his team identify the person behind the pattern before somebody else dies?

London matters here. Its streets, estates, criminal networks, and large police structure give the books room for gangland stories and serial-killer cases alike. Matt is determined and capable, but he isn't protected from consequences. Injuries, threats to people close to him, and the pressure of repeated exposure to violence all follow him from book to book.

Start with A Reason To Kill. It introduces Matt, Beth, the unit's working world, and the personal stakes that carry forward. Reading in order is the best choice, because Matt's recovery, relationship, and career progression are part of the ongoing story.