That describes Orphan Black Season 2 Episode 10, the second season finale of this brilliant BBC America program.
They wouldn't dare not renew the series, would they? After a finale like this one that will have people talking for days, it's highly unlikely we won't hear about a renewal very shortly.
The Dyad is, essentially, done and a new organization was revealed with a surprising figurehead -- Marian Bowles. Low and behold Michelle Forbes was not the bad guy! Congrats to her for moving away from coming in as the big bad. This was much better.