About mice and magic

David Farland "On Mice and Magic". More than anything, Benjamin Ravenspell wants to have a pet. But when he buys a mouse named Amber, he gets more than he bargained for. As soon as Ben takes her home, Amber immediately turns him into a mouse. You see, Amber has magical powers, and it just so happens that Ben is a familiar, (a creature that stores magical energy). Together they are powerful wizards, separately they are just parasites. Before long, Ben and Amber will find themselves embroiled in an epic battle with a magical enemy who is as mad as he is angry, and the fate of the world will depend on whether they learn to work together.