Not having read the book I was straight in blind here. Basically it's atmospheric; well visualised, some great actors (sorry, to be politically correct, do I need to describe them as thespians ? ? ) . Rebecca Ferguson is absolutely marvelous in her role as Juliette Nichols, and it was great to see Will Patton ( remember the classic Falling Skies ? ) and Iain Glen ( Resident Evil; Game of Thrones ) lt's not just a sci - fi story as the Mystery element is the overwhelming genre. It's a bit plodding in the middle at times , but the last episode of the 1st series just leaves you demanding more - lovely twist !