A Johnny Maxwell Story.
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 . . .
The final hugely entertaining Johnny Maxwell adventure for young readers from the master of comic fantasy, Terry Pratchett.