'I don't want my life controlled by a fridge.' Humming in the kitchen of Bugg and Dilan's new home is a huge, mysterious fridge. Even when Bugg turns off the power, the light stays on. Plus, it's full of strange-looking yoghurts in glass jars with wax-paper lids. Should they? Shouldn't they? They do, but the yoghurts take them back to 1974. What follows is a desperate scramble across time and space, in which the siblings discover a 40-year-old time crime and become painfully aware that small changes they make in the past can have huge consequences for their future.