Brian Dennison took over the case when Bomber Lawrence retired, but after a year on the job he comes to realise that Mossi's tracker, Bob Brennan, is unlikely to nail him before he, too, hangs up his gun. It's time for a fresh angle, and Dennison decides to recall young Harry Dell'Appa, a sergant who had been banished to Western Massachusetts because of his 'attitude' problem. And when the two of them put their heads together, they at last begin to understand the principle of Bomber's Law ...