The Gunbower Mystery

Three girls are out camping with their family in the bush. They spend most of their days running around the bush, fishing, or paddling in the kayak.
Until one day they come across something new. Someone has dumped come rubbish in the bush, and then a few days later, someone has lit it on fire.
But this isn't the first time something like this has happened, and the arsonist is still roaming the bush.
The girls must find out who this person is, and stop him, before he does something that risks the lives of everyone camping in the bush...