Kiera believes that she has found a new ally from the future and that he can take them both back there. Alec uncovers his family's connection to the ongoing plot and steers Kiera to a way to stop a city centre bombing.
It's the season finale and everything kicks up a notch in terms of pace and interest. The subplot with the potentially mad time traveller with a route back to the future is pretty predictable, but manages to be fun enough not to get in the way.
The finale throws in a couple of twists and asks the questions about whether a time traveller could ever actually affect what has already happened. If the show had been this good from the start then we might have been more worried about whether it would come back.
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