"Season two hits the ground running with Sarah in a desperate race to find her missing daughter Kira, and a wild pursuit that brings her head-to-head with ruthless pro-clone, Rachel. This season also rejoins Sarah, Alison and Cosima as they struggle to keep the 'clone world' a secret and pick up the pieces of their broken lives - all the while dealing with the harsh reality that literally no one around them can be trusted. Orphan Black returns Saturday, April 19, 9:00pm ET/PT." -- iTunes Store
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the fine print: Downloads posted on the Free iTunes Downloads blog are usually free for ~1 week. After that, you'll have to pay for them.