Author James Patterson, best known for adult suspense novels, makes a foray into the young adult market with this book about a group of human/bird hybrids. For teens who just want action and excitement and who don't much care about the niceties -- such as logic, character development, consistent voice, or plot -- this will be plenty of fun. There's lots of gritty violence, but no sex, drugs, or language problems to worry parents (at least those who don't worry about gritty violence). And there's the fantasy of winged flight, which is always a kid-pleaser.
The entire book amounts to little more than a prologue to the series: Despite more than 400 pages of chases, fights, break-ins, and almost non-stop action, practically nothing actually happens. The main characters are captured, they escape, they are cornered, they escape, they are wounded, they recover, they try to hide, they are found, over and over again. In truth, very little of it makes any kind of sense, though there are plenty of hints that it will eventually -- just not in this book.