Changeling

Magic is fading from the Wild Wood, and the goblins have a choice. Allow themselves to fade away, or do something about it.  When a rare and magical changeling is born, Kull decides to do something.  He ventures out of the forest and into a human home where he plans to swap the changeling for the human baby, but a moment of distraction leaves him confused.  It also leaves a human family with a sudden set of twins.

Tinn and Cole are raised like twins, but everyone knows one of them is really a goblin.  They go about their mischievous 13-year-old boy lives until a mysterious message sends them on a quest to find out the truth once and for all.

As they venture into the Wild Wood, they will meet strange and magical creatures, and it will be difficult to know who to trust.  They know this much.  One of them is a goblin, and if they don't make it through the Oddmire, that brother will die.

There is also The Thing, a dark creature who feeds off fear and despair stalking the boys through the wood.  The Thing can smell the changeling's magic and wants nothing more than to devour him.

This series opener by William Ritter is fast-paced and full of strong ancient magic.  Though the book is relatively short, it fleshes out the characters well and even allows the mothers to be important to the story.  I can't wait to see where the next book goes.  This one gives me Neil Gaiman vibes!  Highly recommended!