The Dresden Files: Portland
Bart is Nathan Delacroix’s younger brother. He is fiercely loyal to his older brother, though he sometimes resents being the younger. He is wilder than Nathan and has a harder time controlling his berserker instincts as a lycanthrope. He has run to Portland with his brother away from the wizard that has chased them there.
UPDATE: He and his brother have been apprehended by the Oregon state police and have been remanded to the authorities in Louisiana.