Luna and the Arsonists

The Fire Danger is Catastrophic and a Pyromaniac is loose
Fires are being started in the driest state of the driest inhabited continent. Even 'normal' criminals don't want a fire storm to destroy a town. As a cat I worry about all the animals killed in fires.
With the help of my 13 year old friends in the Gang of Four and Charlie the 11 year old fugitive from injustice, I set out to catch the arsonists terrorizing my area.
The police are also trying to catch the arsonists but have found one of Charlie's devices.
The Barron brothers are criminals but are they the arsonists?
My friends suspect John and Bill Smith, the police suspect the Barron brothers and I suspect the detective inspector in charge of the case. And where does Roger Brown fit in? This heroic little boy with his tragic history seems to be the link between the different groups. The different groups meet on a day of catastrophic fire danger. If we fail to stop the arsonists the town of Nairne will be in the path of a fire storm fanned by a ferociously hot northerly gale off the desert.