This is a really interesting episode, where we get to find out how each Torchwood agent was recruited. It shows the dark side of the agency quite well, with Jack basically blackmailed into working for them in the Victorian times, and Owen made to think gone mad with grief upon losing his girlfriend to an alien parasite. And then there's Tosh's origin, her Mum kidnapped by a criminal gang no less and Tosh held prisoner by UNIT in a sort of prison camp facility, being told that she's not allowed to contact her to make sure she's okay. UNIT were really cruel there!

It's no surprise who it turns out planted the bombs, but then I don't think its meant to be, and the confirmation just makes for an exciting cliffhanger into the final episode.