The Magic Mole — Martha Kehr

Traveling to another universe is as simple as making a wish. Trying to explain to their mothers where they've been all day is a bit more tricky.  Marcy Lynn and Sara Blue are two thirteen year old girls who didn't think they'd ever find another person who truly understands them until a chance meeting brings them together the summer before seventh grade. As their friendship blossoms they begin to think things can't get any better, until one day a power magic enter their lives. They discover a travel device (the magic mole) which allows them to travel to an alternate universe where every creature imaginable exists! Marcy and Sara soon learn some things are not what they seem to be. Along the way, Marcy is stabbed, they are imprisoned in a goblin village, and they are forced to work as slave laborers. The more dangerous their adventures become, the more they begin to wonder how Marcy ended up in possession of this magic item in the first place. Why her? And more importantly who is behind its giving?