Firewatcher: Brimstone

The first in a trilogy, Kelly Gardiner's Firewatcher: Brimstone weaves together not one but two exciting historical events in a neat time slip structure. When Christopher Larkham finds a mysterious ring on the banks of the Thames in the London Blitz, it seems to give him the power to travel back three hundred years to the Great Fire of London in 1666. Kit darts back and forth between two cities in fiery extremis, using his knowledge of the past to combat the slow-moving but catastrophic seventeenth century blaze -- but he also has to contend with the sinister Brother Blowbladder and his evil plans.

There is plenty of action in this fast-paced adventure, and the other volumes in the Firewatcher series take Kit further back in time, to Saxon Lundenwic and Roman Londinium. I love the concept of getting two historical timelines in a single book, and the idea of linking fires from different eras. An engaging story for younger readers.