“Aha!” said Billy, in as brave a voice as he could. “I think we’d better take a look around. These may not be friendly footprints.

Billy broke off a long icicle with a sharp point and that made him feel much braver.

“Come on, Lily,” he said, waving his icicle sword, “follow me.” And they crept through the fruit and vegetables, looking under the lettuce and behind the strawberries. Nothing. There was nobody in the cheese dish, no sign of life among the eggs, nothing except yoghurt in the yoghurt pots.