The Witness
A missing witness. A killer case. Can Jack Valentine find the witness before an entire legal case implodes?
When a key murder witness goes missing, defense attorney Jim Kowalski approaches private investigator Jack Valentine.
Hired to find a young woman who can clear his client’s name, Valentine digs deep into the case, entering a trial full of fraud, bribery, and corruption.
To find the missing witness, Valentine must follow every clue and turn over every stone, steering him into a world of powerful politicians. Fighting against corrupt Union officials, dishonest candidates, and brutal crime gangs, he encounters danger at every turn.
Forcing his way into a world of bribery and lies, deceit and violence, Jack Valentine uncovers evidence that could change the entire case.
But to save the witness, to uncover who is at the center of the deception, he will need to risk his own life to expose them…
‘The Witness’ is the fifth book in this high-stakes mystery series. It can be read as a standalone story or part of the heart-pounding Jack Valentine series.
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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.

