Mum has just got a new job as a firelighter in some unheated volcanoes nearby. It doesn't matter to Dad, who's at work all day anyway. & it doesn't matter to Puffing Bill, who just blows smoke rings & backfires all day. But it does matter to Crossfire
- a lot. Who will sing his puff-a-bye at bedtime? When their new au-pair, Smokescreen, arrives & doesn't do anything like Mummy used to do, Crossfire is quizzical & upset. Gradually, though, as the rapport grows between the dragon au pair & Crossfire, he realizes that being with Smokescreen instead of Mum is lots of fun in a different way.