Johnny Maxwell and his friends have to do something when they find Mrs Tachyon, the local bag lady, semi-conscious in an as long as it`s not the kiss of life. But there`s more to Mrs Tachyon than a squeaky trolley and a bunch of dubious black bags. Somehow she holds the key to different times, different ears - including the Blackbury Blitz in 1941. Suddenly now isn`t the safe place Johnny once thought it was as he finds himself caught up more and more with SMARTIES PRIZE, SILVER MEDAL WINNERSHORTLISTED FOR THE CARNEGIE MEDAL AND THE CHILDREN`S BOOK AWARD.