Justus, Peter, and Bob are best friends and detectives. Together, the three ??? have already solved many tricky cases. Whether at the beach, in the mountains, or at home in the garden: with this book, kids' fans are guaranteed to have an exciting holiday. The number and letter puzzles, fun spot-the-difference pictures, tricky mazes, and puzzles are a brilliant way to pass the time while also training logical thinking, perseverance, and motor skills. The games and puzzles are lovingly illustrated, and a new short mystery with the cult detectives is, of course, included as well.