The Thief
The hunt is on.
When a police investigation into a robbery finds no leads, property developer Mark Costa turns to private investigator Jack Valentine. Hired to do what the police couldn’t, Valentine digs deep into Costa’s past, revealing a life full of fraud, deceit, and violence.
Mark Costa had a history of making enemies, and the list of candidates who stole the valuable item was long. To discover the truth, Valentine must follow every lead and uncover every secret, steering him into the criminal underworld. Fighting against gang-members, corrupt officials, and ruthless crime syndicates, he steps closer to danger at every turn.
Forcing his way into a world of corruption, Valentine uncovers evidence that could expose more than just a thief.
But to reveal the truth, to uncover who is at the core of the problem, Jack Valentine will need to risk his own life to expose them…
‘The Thief’ is the fourth book in this high-stakes mystery series. It can be read as a standalone story or part of the heart-pounding Jack Valentine series.
Readers also enjoyed
Peter O'Mahoney
Peter O’Mahoney is a bestselling author celebrated for his gripping legal thrillers that explore the complex, often murky world of justice. With a background in psychology and criminology, and as an active member of the American Society of Criminology, O’Mahoney brings striking authenticity and insight to every page.
A criminologist with a deep passion for law, O’Mahoney crafts fast-paced, tightly plotted narratives driven by morally conflicted characters and high-stakes courtroom drama. His acclaimed series—including Dean Lincoln, Joe Hennessy, and Tex Hunter—challenge readers to confront the gray areas between right and wrong.
Jack Valentine Series
Jack Valentine Series consists of five books. The current recommended reading order for the series is provided below.

