The Dandelion Caper

Calvin and Kathy realize that something weird is going on at the old Diefenbacher place, but even they aren't ready for invisible lizards with nervous dispositions and scratchy toenails. Or for Dandelion, the very yellow cat who likes to ride in bicycle baskets and seems to be an old friend of Calvin's Uncle Harold, who used to tell stories of his own about visitors from outer space.

Most of all, though, they aren't ready for an invisibility gadget that makes you partly invisible and totally blind and tends to disappear itself if you don't keep an eye on it. And midnight intruders who leave traces of green blood behind, not to mention a shrinking spaceship... and a suspicious sheriff.