Who stole a million Norwegian kroner from the old lady Molly Vang? What lies hidden in the old, closed down railway tunnel? How come there is red pain running on the side of the road? How did Tiril and Oliver befriend Ocho? Where does the mysterious blue package come from? And what secret ingredient ought to be added when making Matilda’s muffins? In this book you receive the answers to all these questions! Operation Racing Stripe and Other Mysteries contains six thrilling tales about Tiril, Oliver and Ocho.