The Killer Collective by Barry Eisler
When a joint FBI–Seattle Police investigation of an international child pornography ring gets too close to certain powerful people, sex-crimes detective Livia Lone becomes the target of a hit that barely goes awry—a hit that had been offered to John Rain, a retired specialist in “natural causes.”
Suspecting the FBI itself was behind the attack, Livia reaches out to former Marine sniper Dox. Together, they assemble an ad hoc group to identify and neutralize the threat. There’s Rain. Rain’s estranged lover, Mossad agent and honeytrap specialist Delilah. And black ops soldiers Ben Treven and Daniel Larison, along with their former commander, SpecOps legend Colonel Scot “Hort” Horton.