It is quite common for young children to complain about the "monster" under their beds, but never have their parents ever actually seen these creatures and so they blamed it on the child's imagination. But what if the children weren't making it up? Young Angela Browne had her own "monster" and as soon as the girl went missing, it was up to Isolde to bring her back. Except, doing so requires her to venture out to the Human world and risk being found out.