tomorrows book

Earth is a fairly small place, but it''''s all Bath has. It''''s the only home he''''s ever known for all of his 500-or-so-million years of life. One day, Bath realized his treasured Earth was being drawn into the next mass extinction ahead of schedule. So, fascinated by the humans and their quick rise to power (after all, setting off a mass extinction is a pretty sizable achievement), what''''s a nearly all-powerful, somewhat bored, morally ambiguous, savagely violent, shapeshifting alien entity to do other than assume the form of a human and do some front-line investigating?