Somebody Told Me — Stephen Puleston

A gangland murder...
When DI John Marco discovers the body of Felix Bevard he knows instantly the killing was a professional hit. But the criminal underworld don't share secrets easily and with no apparent motive, Marco is forced to delve into Bevard's murky past to try to find the murderer...
An impossible killer...
As Marco examines Bevard's past crimes, one name keeps cropping up - notorious gangster Jimmy Walsh. A brutal murderer, Walsh has a motive for killing Bevard and the power to do it, but there's just one problem - Walsh is already behind bars.
A race against time.
Corruption at the heart of the system seems the only answer. How else could Walsh kill with impunity? But as Marco's investigation develops, new leads spring from cases once thought closed, and the net closes ever tighter on Walsh. Until Marco's own family begins to face threats to their life that could jeopardise the whole case.
Now Marco must prove Walsh's guilt or catch the real killer still be at large, before Marco becomes a victim himself...