The four young mages, Tris, Sandy, Daja, and Briar, are just starting to settle into their new home at Winding Circle Temple. But even as they struggle to cope with the powerful magic that binds them together, Winding Circle comes under attack by pirates armed with fierce new weapons. Working closely with their teachers, the mages Niko, Lark, Frostpine, and Rosethorn, the four youngsters move ever more deeply into their magic as they help to fend off the escalating attacks. But how deep is too deep? Packed with humor, magic, fantasy, and thrilling action scenes, Tris's Book vividly demonstrates why Tamora Pierce is America's most popular writer of young adult fantasy.