Orphan Black follows outsider, orphan and street-wise chameleon Sarah, who will be portrayed by actress Tatiana Maslany (“Picture Dayâ€). After witnessing a woman’s suicide, Sarah assumes the stranger’s identity, who happens to look just like her. Expecting to solve all her problems by cleaning out the dead woman’s savings, Sarah is instead thrust headlong into a kaleidoscopic mystery as she realizes the dizzying truth: she and the dead woman are clones.