In the bucolic town of Sanctuary, a body is strung up to a tree outside the local high school. The only thing more shocking than the crime is its heinous nature: the mysterious victim has been skinned and drained of all his blood.

Detective Maxim Dwyer knows the murder is a message, but who it's from is not so clear. The few clues he has point to his friends, the Seventh Sons Motorcycle Club. Diego de la Torre is part of that pack now, but brotherhood comes at a price when blood is spilled. Meanwhile, Kayda Garnett returns home with a college degree to find her family torn apart by the same tragedy. Only half-Yavapai, she is considered an outsider, but finding a peaceful alternative to the violence may finally win her the respect of the tribe.

Despite best laid plans, California bikers incite a gang war, the FBI undermines local police, and vigilantes take the fight to the streets. What starts out as a simple murder may soon run Sanctuary red with the blood of brothers.