From the Steam Store page:
The Deed is a game in which you must commit a murder and then, through a process of making the right choices and planting the appropriate evidence, convince the authorities of your innocence and somebody else's guilt. The stand-alone expansion Dynasty offers three new scenarios based on this original concept.

Taking place in three different eras, each of these new scenarios allows you to explore the sordid ancestry of the Bruce family as you take control of a character who aims to commit a murder and escape free of suspicion by framing one of the other characters in the game. You will explore a 15th century English castle and a wild west frontier saloon, before finally returning to Dunshiel House fifty years prior to the events of the original game.

Just as in The Deed, every decision you make can influence the outcome and lead to one of many possible endings, which are even more varied and numerous this time. There are many ways to do the deed, multiple pieces of evidence to use to your advantage and a wide selection of characters to frame for your crime.