I am always apprehensive reading a book by an author that is not part of the established series that started me reading the author: I refer of course to the Alex Delaware books, which I just love - but this time I needn't have worried. Alex does get a look in and Milo gets a mention, but this is Petra's own - although not the author's usual style, he has done a great job with the characters and unlike one review I read, I didn't think his 12 year old was "too intelligent". I liked the switching from one character to another's point of view - especially Billy's, to me he was being just a normal 12 year old although more compassionate and moral than what seems normal these days. A lovely little vignette of a character was Sam Ganzer - Billy had to find somebody who wasn't going to let him down! The suspense is built up cunningly: first you think you know who it is and then you don't and when the ending arrives, justice prevails in a very satisfying manner. Petra and her partner, Stu Bishop are written as real, credible people who you care about what happens to them - and all the way through you're worried for Billy and HAVE to know what happens next. In fact, one of the great Kellerman reads!! I hope Petra and Stu come back to visit again