A thriller that combines Alternative History, Espionage Fiction, Detectives of the Occult and a few slight drops of Lovecraftian Horror, all written in pulp code.
Believe it or not, this is not the first fictional pairing of Houdini and Mata Hari. The famous spy joined Houdini and Sir Arthur Conan Doyle in the 1978 play The Houdini Deception. The 2010 book Dear Sweet Harry offered a poetic take on the couple, as did a 2010 concert in Wellington, New Zealand (poster below). As far as I know, the real Houdini and Mata Hari never met.
You can purchase Agentes H: Enemigo en Nueva York at Amazon.co.uk.