"22E ... Officer Down!""22E Officer Down " the radio blared. When California Highway Patrol Officer Sonny Tyler is gunned down on a rural Northern California road near Eureka in 1970, the Humboldt County Sheriff's Department puts their best man on the case. Detective Sergeant Don Regan, a rising star in the Department, worked obsessively to solve the case and keep a promise he made to Officer Tyler's nine year old son, Casey. But the clues are few and they lead nowhere, and