Reacher and Neagley make a final desperate attempt to save O’Donnell and Dixon, stop A.M. and avenge their friends’ murder.

Neagley and Dixon discover shocking information about an old friend in Denver while Reacher and O’Donnell learn more about the nefarious and mysterious A.M..

The team must deal with a mass casualty event that forces them to put aside their emotions following a recent tragedy.