As summer ends on Hazel Tree Farm, the Farrellys have a lot on their minds. There is a new herd of giddy Angus heifers to take care of while Kate is busy with her ‘Operation Plan Bee’. However it is the arrival of the glamorous Sinclairs to Ballynoe’s Greenway Manor that has everyone in a tizzy. Everyone that is, except Peter, who has a bad feeling about the rather snooty Simon Sinclair. However it’s only when the children discover a secret passage at Greenway Manor that things take a mysterious turn. Another exciting farm adventure with the gang of Hazel Tree and a host of their furry and feathered friends!