The death of the McReal brothers marks the end of an era for those who believe in "just" retribution. Without their presence to oversee the final act, the targets of their vengeance work now walk free, perhaps unaware of how close they came to total erasure.
If you are looking for similar literature or media involving "vengeance" and brothers, here are several works that may fit: Angel of Vengeance (Preston & Child) mcreal brothers die without vengeance work