I loved the math content and an impressed by the authors' grasp of it. Fascinating. BUT, several absolutely implausible situations. Witness to a robbery two years ago returns for the first time to Tahoe, and the robber just happens to spot him at a Casino. Sandy makes a last minute flight to Germany, and four hours after arrival goes to interview two witnesss to the robbery. The robber is able to make a reservation, get there ahead of her, buy an illegal gun, find out where the interview is to take place, find a second story window overlooking interview, do his mischief, get away, flies back home. Really? These are only two of the stretch-your-credulity sequences that happen. Pretty good plot, good math content, and if you can dismiss any interest in logic, enjoy the book.