When Sophie goes out one morning to feed her cute little dwarf rabbit, she discovers to her horror that Fridolin has gone! Her parents are sure that Sophie has forgotten to close the stable door and are deaf to her claims that she has found suspicious footsteps and a mysterious scrap of cloth.
Only her brother Leon and her friend Anna are prepared to stick by her. Together they decide to investigate the theft. Whilst undertaking their detective work, the three animal agents stumble across a major plot and a dark secret. Many more animals have disappeared from the surrounding area!