This is the fourth book in a series about extreme sports. The background is set in the Pacific Northwest. Meg Reed is a reporter for an online magazine on sports. She is an active participant in the sports. There is an underlying theme of the death of her Father a.k.a. as Pops. The detail is superb and takes you to the area. The characters have become friends from the first book. Meg, the protagonist is recovering from the death of Pops. She has two best friends, Matt and Jill. Greg the owner of Northwest Extreme. Grams her grandmother. There is a 5-K Mud Race and Meg is participating in it. The training program is three weeks and then the Mud Race. The Trainer is ex-military and trains the members of his class hard. These characters are described in detail. Billy’s partner is Dylan a health specialist. Members of the class include Tim, an overweight businessman, Jenny, a housewife and a TV reporter, Kelsey who out to make headlines. Billy is found dead in the locker room. It is unexplained death. Meg explored the situation and needs an answer before she loses her life. I recommend this book and series Disclosure: received a free copy from Kensington Books through NetGalley for an honest review. I would like to thank for this opportunity to read and review the book. The opinions expressed are my own.