Hunter - All Change (Hunter, the Accidental Assassin series. Book 3)

The continuing story of a man who has taken the decision that he will no longer stand by and allow criminals to behave as if there will be no consequences for their actions.
Taken under the wing of the leader of a team of ex-special forces personnel also engaged in the ongoing battle to stop the spread of drugs, terrorism and lawlessness in civilised society from running wild.
Hunter, who is making a name for himself, has a specialist skill which is in danger of becoming a recognisable signature, decides to relocate his base of operations.
The 'work' he is engaged in shows no sign of drying up. His instructions are simple, "every time the bad-guys put their heads above the parapet, it will be your job to put a bullet in them."