Mystery of the Mixed-Up Teacher

Dallas O'Neil and his Baker Street friends are back! And now, besides playing their favorite sports, they are also solving exciting and sometimes dangerous mysteries! Several of Dallas's friends are in the same class at school, and there's just a month to go until summer. They love their teacher, Mrs. Lucas, who always makes school interesting and exciting. She's the best teacher they've ever had. Not only that, but she's from their church, so she encourages them in their faith. But suddenl...