Fever House by Keith Rosson

When leg-breaker Hutch Holtz rolls up to a rundown apartment complex in Portland, Oregon, to collect overdue drug money, a severed hand is the last thing he expects to find stashed in the client's refrigerator. Hutch quickly realizes that the hand induces uncontrollable madness--anyone in its proximity is overcome with a boundless compulsion for violence. Within hours, catastrophic forces are set into motion--dark-op government agents who have been desperately hunting for the hand are on Hutch's tail, more of the city's residents fall under its brutal influence, and suddenly all of Portland stands at the precipice of disaster