It’s surprising how good BBC Worldwide’s new show Orphan Black is, especially when you consider the premise: Sarah, a tough woman with a troubled past, meets her clone, Beth, just as Beth is committing suicide. Sarah assumes Beth’s life in order to raid her bank account, then learns that there are other clones—fewer now that they’re being killed off. And it seems that Beth was a cop with a past of her own. Why did Beth commit suicide? How will Sarah escape with Beth’s money? Who’s killing the clones? What does “Orphan Black” mean, anyway? Orphan Black is a puzzle box of a show, one that the audience and the main character are trying to open.