Stiletto (The Rook Files, Bk. 2)

When two secret organizations are forced to merge after years of enmity and bloodshed, only one person has the fearsome powers--and the bureaucratic finesse--to get the job done. Rook Myfanwy Thomas must broker a deal between two bitter adversaries:

The Checquy--the centuries-old covert organization that protects society from supernatural threats, and...

The Grafters--a supernatural threat.

But as bizarre attacks sweep London and threaten negotiations, old hatreds flare. Surrounded by spies, only the Rook and two women who absolutely loathe each other can find the culprits before they trigger all-out war.