Revenge Season 3 Spoilers: Margaux's half-brother hits the Hamptons in finale

ABC's Revenge is plowing ahead through Season 3 with numerous twists and turns, and it seems as though another soapy turn is coming in the finale.

The "Spoiler Chat" column at E! Online reports that Margaux's half-brother will stop by the Hamptons for the final episode of the season:

"Revenge has the best twists. How 'bout a little tease of one?
Margaux's half-brother, the devious and dashing Gideon, make an appearance in the season three finale. And he's sticking around for season four (it's just a formality that ABC hasn't announced one yet). But be warned: he has a dark side."

In other Revenge news, the "Spoiler Chat" column at E! Online also reports Emily's mental problems might not be the only threat she faces in the near future.

"Barbara: Anything on Revenge? This season is insanely good!
Is Emily's cover about to be blown?! Fans will be meeting the clever and dangerous NYPD Homicide Detective Brian Hosko later this season and he is definitely onto her. And yes, you read that right: homicide is hitting the Hamptons again!"

Between blackouts and homicide detectives, it's a wonder Emily's secret hasn't been exposed yet.

"Spoiler Chat" also revealed the following news about the 20^th episode of this current season:

"When Revenge finally comes back from their ridiculously long break, we'll be meeting many new characters. Specifically in episode 20, entitled, 'Revolution,' we'll be meeting Brandon, one of Victoria's terrifying and manipulative henchmen. He's creepy and dangerous, but his good looks and charm lets him fit right in at any Hampton soiree. Watch your back, Emily!"

What do you expect from Margaux's half-brother in the finale? What dark side is he hiding? Let us know in the comments below.