Ghost, Cormac and Kate are not like other kids. Ghost can turn invisible, Cormac can run up walls and Kate can talk to animals \- all abilities which make them perfect recruits for the Black Lotus, a training school for ninjas. But when the Moon Sword \- a source of unimaginable power \- is stolen by samurai, the three are forced to put their new skills to the test in sixteenth-century Japan \.