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Under the Line

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A body left as a warning. A force he can’t trust. A mission he can’t afford to fail. When a gangland witness is unearthed at the Olympic Stadium, DC Jake Tanner suspects it’s an inside job and...
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  • 16 September 2025
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Dead men can’t speak.

When Danny Cipriano’s body is discovered buried in a concrete tomb at the London Olympic Stadium, one thing becomes clear: the former leader of The Crimsons knew too much.

And somebody wanted him silenced.

For good.

Only problem is, DC Jake Tanner thinks he knows who and immediately begins pointing fingers. But as the investigation develops, he realises the tentacles of corruption have spread far and wide, and that the financial gains to be had from it are far greater than he imagined.

With financial pressures of his own, and betrayal and deceit lining every one of his colleagues’ decisions, Jake finds himself under the line of duty and faced with a choice. Will he be tempted to tread the path he promised never to take, or will he betray the ones he once thought he could trust?

But when you can’t trust your own, who can you?


Under The Line is a gritty crime thriller perfect for fans of Simon McCleave, Rachel Mclean, and the BBC's Line of Duty.

Also in the series:
Toe the Line (Book 1)
Walk the Line (Book 2)
Under the Line (Book 3)
Cross the Line (Book 4)
Over the Line (Book 5)
Past the Line (Book 6)

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Price: $19.99
Pages: 526
Publisher: Vinci Books Ltd
Imprint: Vinci Books Ltd
Series: DC Jake Tanner Crime Thriller
Publication Date: 16 September 2025
Trim Size: 7.80 X 5.10 in
ISBN: 9781036705466
Format: Paperback
BISACs: FICTION / Mystery & Detective / General, Crime and mystery: police procedural, FICTION / Crime, Thriller: organised crime / gangland crime
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Jack Probyn writes murder mysteries and crime thrillers set in England. He studied Creative Writing at the University of Surrey and has always been fascinated by storytelling, particularly the dark and twisty kind. He is the author of the DC Jake Tanner series and the DS Tomek Bowen series, both packed with suspense, mystery, and unexpected twists. When he's not writing, he enjoys building LEGO, solving sudoku puzzles, and occasionally going snowboarding. He lives in England with his partner and their British Shorthair cat, Tommy.