The search for a friend's killer is a riveting lesson in the way war has changed. The EOD-explosive ordnance disposal-community is tight-knit, and when one of their own is hurt, an alarm goes out. When Brian Castner, an Iraq War vet, learns that his friend and EOD brother Matt has been killed by an IED in Afghanistan, he goes to console Matt's widow, but he also begins a personal investigation. Is the bomb maker who killed Matt the same man American...