Oh, I loved this one, and loved it hard!
Technically it's the 8th installment, but chronologically it starts when Reacher is still in the army. I loved this glimpse of his past. Reacher in the army, with his mother, in Paris. I enjoyed all of it and finally this was a book that kept me guessing and interested for the longest time. Absolutely recommended, and an absolute must for Reacher-fans.