When the victims have no voice...

The first victim was poisoned. Three others are missing. One turns up dead.

It's almost Christmastime, but FBI agent and profiler Brandon Fisher and his team are packing their bags for Colorado to stop a serial killer. But they soon find out this might not be an easy case to solve as the killer's method of operation keeps changing.

A look into the victims' pasts reveals one commonality, though: they all beat charges of animal abuse. The killer, known as the Advocate, is inflicting the same treatment on them that they had...