Don't be put off by the poor cover design, this is one of the best children's books I've read for ages (and I review them in a national paper). Dan and Ursula's terrifying adventure, snatched by a yellow mist and deposited in Roman Britain, firghting on the side of the Celts (or Combrogii) in a parallel history to our own is superbly done. Each discovers a special gift: Dan is a beserker, gifted with the strength of ten men but terrified of the killing rage that he sinks into. Ursula, fat, tall and surly is mistaken for a boy. Friendless at school, she forges a bond with Dan and graudally discovers that in this world she has the powers of a Druidess. The Combrogii are desperate for help in fighting the cruel Romans, and when they all see the murders of Celts at Alavna, they swear to avenge it.
I read this to my 8 year old, and she adored it as much as I did. SPlendidly imaginative, very well-written - please could there be a sequel soon?