Query: kindle, the grey man series
One Minute Out (Gray Man Book 9)
Mission Critical (Gray Man Book 8)
Agent in Place (Gray Man Book 7)
Gunmetal Gray (Gray Man Book 6)
The Grey Man- Changes
The Grey Man: Payback
Dead Eye (A Gray Man Novel Book 4)
Ballistic (A Gray Man Novel Book 3)
On Target (A Gray Man Novel Book 2)
The Gray Man (A Gray Man Novel Book 1)
Back Blast (A Gray Man Novel Book 5)