The mini beasts across Honeywood are left worn out after an awful disease makes the bees sick. Many sick bees have been taken to Nightingale Hospital to be looked after by Lady Scarlett and the ladybird nurses. The little bees are so ill that their families are not allowed to come in to see them. To keep them happy, the ladybird nurses read them loving letters and cards written by their families, which are delivered every morning by the caterpillars. The caterpillar family struggle to carry the heavy sacks, so Betsy, Bobby, Blue and Bella use their enterprising skills to design something innovative to make the caterpillars’ lives easier, but will it work?