The action finally picked up on Dexter this week, as two people were killed and the show's title character took action beyond the mere doling out of advice.

Will next Sunday's "Circle Us" continue to pick up the pace? Will it make viewers care more about Lumen? Will it provide us with another man suspected of brutalizing her?

The following preview doesn't officially answer those questions, but it does make it clear that the relationship between Dexter and Lumen is growing by the kill day. She clearly won't replace Rita, but might she be the dark partner Dexter has always been looking for?

[video url="http://www.tvfanatic.com/videos/circle-us-promo/" title="Circle Us Promo"] [/video]

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.