The Shadow of the Great Fire

The seventeenth book in the Shadows from the Past series:

In 1666, as London recovers from a deadly plague, the old medieval city with its narrow streets has become a tinderbox. After a long, hot summer, a small spark is all it takes for the whole place to go up in flames - but is this a simple accident or a deliberate act of sabotage?

Towards the end of August, only days before the Great Fire will break out, three time-travelling children and their talking cat land on the doorstep of one of the most famous figures of the 17th century. Can they discover why they've been sent there before it's too late? Time is running out...