Real-life best friends Ruth Syratt and Megan Stevenson run a vintage bric-a-brac shop in Muswell Hill, London. Stumbling across a time machine, they embark on trips to the past to stock their emporium with quirky artefacts with no idea of the irreparable damage they’re causing to the fabric of the universe. After one excursion too many, an interdimensional fissure appears and Ruth must free Megan from The Unreason, a monstrous netherworld where a convoluted game is played for all eternity.