Ancient Japanese gods and monsters are unleashed on modern-day London in this first book of an epic trilogy. When Mio sneaks the family's katana -- a priceless ancestral sword -- from her parents' attic, she just wants to spice up a costume. But the katana is much more than a dusty antique. Awakening the power within the sword unleashes a terrible, ancient evil onto the streets of unsuspecting London. But it also releases Shinobu, a fearless warrior boy, from the depths of time.