Johnny Maxwell and his friends discover that Mrs Tachyon, the local bag lady, holds the key to different times, different eras - 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 then-SMARTIES PRIZE, SILVER MEDAL WINNERSHORTLISTED FOR THE CARNEGIE MEDAL AND THE CHILDREN'S BOOK AWARD