Description Mack Rhino is a private detective-who just so happens to be a rhinoceros-in this chapter book that's perfect for emerging readers! Mack Rhino is a private eye who has just finished solving his 99th case. With his trusty sidekick, Redd Oxpeck by his side (or on his back) he's about to embark on his 100th. There's a big race in town, but all the runners are missing the laces to their sneakers! Who's run off with the goods, and why?