Faster than Lightning by Michael Panckridge and Pam Harvey
I have some serious misgivings about this book, and I hope the rest of the series pays a little more attention to detail. It looks like this is going to be a series of 6 adventure books, each focusing on a personal passion for each member of a friendship group in turn.
This book is mostly about Angus, a 12 year old who lives and breathes horses and horse racing. Not surprising since Dad is a trainer. At the races one day Angus notices a horse resembling a photo he has seen. The horse races well, but it looks like the jockey pulls him up before he attracts too much attention. So far a good mystery setting.
And then the book spirals out of control. There is a lot of dodgy science and illegal breaking and entering on the part of our heroes. Personally I think Angus should be given a few months of community service for his criminal behavior. I finished the book wondering who were the bad guys, the new breeders, Angus or the authors.