Ravenwood

Fourteen year-old Ark has the squittiest job on Arborium, the last forested island in the future.

A poor plumber's boy, he unblocks toilets in the city - a breath-taking, mile-highworld carved out of the vast upper branches of a giant canopy of trees. 

Protected by a poisonous shield, he believes his forest kingdom to be the safest place on earth.