Mark Greaney books in order
12 books in the catalogue, about 124 hours of reading in all; the shortest takes 6 hours and the longest 15 hours.
1 series and 11 standalone books in the catalogue.
The Gray Man
10 books 1 The Gray Man length not known
2 On Target length not known
3 Ballistic length not known
4 Dead Eye length not known
5 Back Blast length not known
6 Gunmetal Gray length not known
7 Agent in Place length not known
8 
Mission Critical 9.7 h 9 One Minute Out length not known
10 Relentless length not known
