Raven, by Sue Loh, is a delightful page-turner of a Young Adult novel. It follows a group of brilliant high-school age computer geniuses, led by a young woman called Fireball, who are called in to fix a network breach at a major bank, and subsequently to figure out who is taking the bank--and other vital institutions--electronically hostage.

It's been a while since I came across such an engaging book. The characters are delightful, and the novel is interesting and well-paced. ( )