Sniffles the mouse has to get an owl's egg for a scavenger hunt, but once he's gotten it, the egg hatches and draws the attention of the mouse-eating father owl.

Sniffles the mouse and his friend the Bookworm decide to take up egg collecting, setting their eyes upon a big barn owl egg. But the big barn owl isn't so hot on the idea.

Even in a wonderful fairy world incidents may occur that require attention of experienced detectives.