Dragon's Tooth is a fantasy novel written by N.D. Wilson. He wrote the 100 Cupboards series. He also wrote Notes on the Tilt-a-whirl a theology book. The link to the review we wrote on the 100 Cupboards (the first book in the 100 Cupboards series) is here.
"Have you ever seen a lightning bug?"
The old man held out a small glass cube. Frozen still in the center was a big black beetle. Cyrus closed his fingers around the glass.
"Careful she's hot," the old man said.
Electricity shot up through Cyrus's arm. He staggered backward and swung his arm down. Glass shattered on the ground as the lightning bug leaped free. With a pop and a crackle, it launched, blue electric arcs trailing from it's wings.
Warning for Christian Readers: There is mild language in the book. Also there is a few times they mention a He likes Her kind of thing.