But to pull it off he'll need the help of a very unlikely party.
PJ Puznowski is a Texan rodeo queen who has family connections that could allow Deane to achieve success.
He flies PJ to London and hopes he can trust her long enough to convince his boss that she (and a fake Monet painting) are the real deal.
But all doesn't seem to be going exactly to Harry's plan and PJ seems to be showing a greater allegiance to Shahbandar.
When he hears he is about to be fired, Harry really has to up his game and get PJ onside.
Gambit is very British in its humour and some of the best moments involve Harry sneaking around.
Watch the trailer here:
(M) Roadshow Entertainment
3 stars