Starring: Sarah Michelle Gellar as recovering drug addict Bridget Cafferty, and ... Sarah Michelle Gellar as Bridget's identical twin sister, Siobhan Martin. 'Lost' vet Nestor Carbonell drops by as an FBI agent, and Ioan Gruffudd and Kristoffer Polaha play the men in Siobhan's life

What It's About: Bridget, wanted by the mob, visits her sister, who promptly disappears while on a boat trip. So she takes Siobhan's place, but soon finds out her twin's lavish life isn't as perfect as it seems. Looks like both sisters have secrets of their own.

Premieres Tue., Sept. 13, 9PM ET on The CW