The Redacted Man

There's a cap that steals witnesses' memory of the wearer, reducing them to little more than a shadowy on the periphery of perception. Even the wearer barely recalls himself. But he recalls his mission.

Stuck in a hidden world that might not be covered by the law, Detective Cassie Kinsala struggles to find a way back to normal. Doing her job becomes harder when she's forced onto a taskforce jointly run by one of the secret societies she wants to arrest.
And if the danger of getting stuck in a war between secret societies wasn't enough, there's an untraceable someone out there eliminating threats to this hidden world.