I had great time reading Nick and Tesla’s High-voltage Danger Lab: a mystery with electromagnets, burglar alarms and other gadgets you can build yourself by “Science Bob” Pflugfelder and Steve Hockensmith. Twins Nick and Tesla have been shipped to their eccentric (ok, mad scientist) uncle for the summer. When their bottle rocket lands behind the gate of a huge mansion closed for renovation, they are chased off by slavering rottweilers and a cranky guy. But Nick sees a girl in a window over the garage holding a sign that says “Go Away”. The kids are determined to find out what is going on. The book includes instructions for Mints and Soda Fueled Robocat Dog Distractor, Low Tech Bottle Rocket and Launcher and other gadgets. I recommend this quick paced mystery to kids in grades three to seven.