I added, ‘Nobody Runs Forever’ as a starting point. How’s that?
I usually start at the beginning of a series, but not in this case. Frankly, it did not seem to matter.
I think Lee Child did some prequels (i.e., focusing on Reacher when he was an MP) after establishing Reacher as an ex-MP. (Could be wrong because I read them in order of availability at my library). So, starting at the beginning would really mean starting in the middle.