Season 3 Episode 9: Masquerade

"The mysteries of the child abductions from time are converging on a single event – a masquerade ball in Dorset. But the ramifications of this are beyond imagination, and will bring Sarah closer to her dark destiny than she’s ever come before. Meanwhile, the Russians set their sights on a different target, and Ethan finds his loyalties put to the test once again. Yet a new threat lurks, something that nobody at all has seen coming – and it will change the world forever…"