New details about the upcoming season 4 of "Orphan Black" reveal that Sarah will delve into the mysterious world of the clone that started it all: Beth Childs. What will she discover and who will she meet? Read on to find out more spoilers about "Orphan Black" season 4, and the 'horrifying" twists to come.

According to a BBC America press release, the "Orphan Black" season 4 synopsis reveals Sarah will try to trace the footsteps of Beth Childs and find out more about her clone:

"Season 4 of the drama will see leader-of-the-pack, Sarah, reluctantly return home from her Icelandic hideout to track down an elusive and mysterious ally tied to the clone who started it all - Beth Childs. Sarah will follow Beth's footsteps into a dangerous relationship with a potent new enemy, heading in a horrifying new direction. Under constant pressure to protect the sisterhood and keep everyone safe, Sarah's old habits begin to resurface. As the close-knit sisters are pulled in disparate directions, Sarah finds herself estranged from the loving relationships that changed her for the better."

We can't wait to finally learn more about the most mysterious clone of all!

Other spoilers for "Orphan Black" season 4 have been few and far between. In an interview with Deadline in August, star of the series Tatiana Maslany did give this juicy tidbit about what to expect from the upcoming season:

"The only thing I know for sure is that it will feel like the pace of Season 1. It will have that sort of mystery," Maslany said.

We're guessing the mystery she's alluding to has to do with Beth Childs and the "elusive and mysterious ally," who may be played by newcomer to the series Joel Thomas Haynes, cast as Dizzy, "an edgy, self-reliant hacker who doesn't conform to group mentality."

TVLine.com reports"Orphan Black" season 4 premiere will air in Spring 2016.