Christopher Nibble and his friend Posie are keeping six hairy caterpillars as pets. They look after their pets very carefully but, one day, the caterpillars disappear. The gardening guinea pigs become the detectives of Dandeville and, with the help of Mr Rosetti, they solve the minibeast mystery.Christopher Nibble and his friend Posie are keeping six hairy caterpillars as pets. They look after their pets very carefully but, one day, the caterpillars disappear. The gardening guinea pigs become the detectives of Dandeville and, with the help of Mr Rosetti, they solve the minibeast mystery.