The Snake King

It's been four years since the Battle of Hogwarts. Rogue Death Eaters are still on the loose, growing & murdering more than just muggleborns. The Order and the Aurors can't seem to get a handle on it on their own, so a wizard who calls himself The Snake King takes its upon himself to hunt down these Death Eaters. Hermione, after helping a recruit of his, finds herself involved. AU