Charlie learns that visibility is relative - but Lola's quick-wittedness is crystal clear. Charlie and his friend Marv have invented an invisibility potion to help them find strange and tricky creatures, which they would prefer to do without Lola interrupting and bothering. But when Lola enlists a little help from her invisible friend, Soren Lorenson - not to mention a tea set, a rabbit, a stroller and, of course, one or three glasses of pink milk - it turns out that the strange and tricky creatures have met their match in one inventive and very resourceful little sister. .