"This fiercely intelligent British chiller from Scottish director Colm McCarthy, whose small-screen credits include Doctor Who, Sherlock and Peaky Blinders, breathes new life into age-old horror tropes, taking familiar fears of zombies, the apocalypse and eerie children and spinning them in surprising ways. Although writer Mike "MR" Carey's narrative about a fungal plague that turns victims into cannibalistic "hungries" occupies a post-28 Days Later landscape, the central obsessions explored here are closer to the identity crises of Never Let Me Go (both book and film), with a strong underlying strain of the very British weirdness of John Wyndham." - Mark Kermode, The Observer