The Wrong Tom Jacks by Simon Kewin
Simms is a genehunter, paid by megarich collectors to track down the DNA of the famous for their private zoos. He's employed to locate the genetic code of Tom Jacks. But not the rock star Tom Jacks, just an unknown namesake.
The job bugs Simms. Something about it is wrong. Someone is playing him. Problem is he doesn't know who or why. None of the illegal plug-in tech filling his brain is much use. The one person who can help him is also the one person on the planet who never wants to speak to him again.
The last thing he needs is Agent Ballard of the GMA interrogating him about someone he's never even heard of.
Someone called Boneyard...
Tripler: The Beginning by Neil Vogler
In the near future an impossible virus is giving people the ability to summon two identical physical copies of themselves into existence at any time and in any situation – sending them violently insane as a side-effect. They call the infected 'Triplers'.
Harry Allwear is a specialist tracker, an experienced, highly-trained operative working for an international organisation dedicated to wiping out the Tripler menace. But after his latest mission goes badly wrong and a dangerous target gets the better of him, Harry regains consciousness to find his worst fear realised: he's been deliberately infected with the virus...
Doppelgänger's Curse by Milo James Fowler
A woman stalked by her double. A detective in over his head.
In a city where the cops are on a mobster's payroll, private investigator Charlie Madison stands in the gap. When a wealthy young socialite asks him to help her catch a threatening stalker, he takes the case. But things aren't what they seem, and Madison has to act fast before he's framed for murder.