Stealing the Duke of Fallwood

Robbin, a thief and cheater, is approached by another thief, Cedric. The older outlaw proposes to rob the Duke of Fallwood. Though Fallwood isn't rich, the Duke is old and has been hoarding the taxes he's collected over his long reign. Robbin proposes a safer scheme. Instead of robbing the manor they could cheat the Duke out of part of his fortune.
The two go to Fallwood and undertake their scheme, pretending to be merchants. But as Robbin tries for a safe steal, Cedric keeps trying for a quick steal. Then the Duke makes a proposal of his own over his own grand-daughter. What will Robbin do to save himself from those schemes?