In the first episode, Rosemary and Laura struggle to revive an ancient herb garden in time for an upcoming royal visit, until the tranquility of the community is shattered by the murder of a young girl.
In the second episode, The granddaughter of famous botanist Edwin Pargeter engages Rosemay and Laura to help tidy up the garden and organize Edwin's seed collection and then a mysterious foreigner turns up dead in the garden.
In the third episode, Rosemary's former boyfriend invites Rosemary and Laura to his home in southern Spain, where he wants them to create a Moorish garden.