Invisible Magic Wand to the Rescue
Lois Wickstrom, editor (anthology)
Caspian and his cousin Belinda are visiting Grandpa's house. Belinda wants an Invisible Magic Wand, just like Caspian's. The wand allows the children to speed up time, or slow it down. While Grandpa is getting the wand, an earthquake shakes the house. Thanks to the wands, all three escape, unscathed.