The dragonsitter to the rescue

Dear Uncle Morton I have to tell you some bad news. We have lost Arthur. He's somewhere in London, but I don't know where. Eddie takes the dragons with him on his half-term trip to London, but it's not long before disaster strikes and both dragons go missing. From the Natural History Museum to the London Eye, through tube stations, hotels and London Zoo, Eddie chases his dragons, hoping to avert disaster. But there's no smoke without a fire...