Regicide the Bitter End of the King of Hearts

After stealing a diamond with a ghoulish legacy from a ruthless business man, the person Interpol has ranked as the King of Hearts (Larceny, theft, and antiquities smuggling) in their card deck of most wanted criminals, a person known only as N. Kermin finds that their customarily flawless getaway has been impeded by a shadowy man in a fedora with a pistol and an ultimatum: steal a state of the art computer encryption program for him, or else.
Shaken by this near brush with death, a longtime companion, William Cardinal takes notice of Kermins subtle but abrupt change in demeanor and soon discovers that his friend has been keeping a hidden avocation. Despite the breach of trust, Cardinal agrees to help seize the cipher and sabotage it with the aim of uncovering anything they can use to their advantage and hopefully deal lethal blow to the fedora topped man and whatever organization he represents.
Struggling to define their friendship in light of this revelation, the two must now rely on one another if they wish to survive not just the heist of a lifetime but evade an army ex special forces security agents, out wit potential spies in their midsts, elude a pair of the finest private dicks a billionaire can buy, fend off the wrath of an invisible criminal empire and dodge an assassins cold retribution.