Author T.A. Barron (The Adventures of Young Merlin) is working with PlantABillion.org to promote his latest release and restore the world's forest ecosystems at the same time. For every free download of the first chapter (available here), one tree will be planted.
In other words, you get a bit of entertainment and an easy way to help the environment for free.
ATLANTIS IN PERIL comes out May 5, 2015. It is the second book in the Atlantis saga, following ATLANTIS RISING.