Rosemary Boxer goes to visit her friend Daniel Kellaway, who suffers from eczema, to receive a cash grant for her university but is asked by him to investigate the dying trees in the grounds of his mansion home. Laura Thyme has left her home after being cheated on by her husband and goes to see her friend Sam, who is later killed in a car accident whilst driving home one night. After meeting one another and forming a firm friendship, Rosemary and Laura begin to investigate into the accident and the dying trees.

Rosemary and Laura are called to Vincent House Health Spa to rejuvenate 'The Dell' a water cascade designed by a women named Fenella Gothe, who has since died.

Fearing they may not be able to get the water running again, they are surprised when Frances Caldecott, the owner of the site, requests a whole new plant arrangement to the one her late husband Edwin originally chose.

Rosemary is given a book entitled 'The Language of Flowers' written by Edwin before he died, but not published until recently. In the book, Edwin has documented how different flowers can symbolize a range of actions and emotions.

Laura and Rosemary are invited to dinner with Frances and her children Kate and Jeff. When Frances doesn't arrive, the party are shocked to find her strangled in her study...

Rosemary and Laura are asked to design a memorial garden based on the myth of Orpheus and Eurydice for an old friend called Julia Moore.

Laura discovers that her daughter Helena is being housed by Julia nearby and tries to heal a rift with her when she blames her parents' break up on her mother.

Laura manages to put her family problems to one side when another tenant of Julia's, a man called Jeremy Pearson is found dead in the soon-to-be memorial garden.

Rosemary and Laura must find out who murdered Jeremy whilst dealing with a mysterious figure, who is vandalizing their work on the garden every night...

Laura is shocked to hear from a news report that Rosemary has been shot dead whilst investigating a problem of dying plants at Engleton Park.

Denying the fact that Rosemary would start a job without her, Laura puts it upon herself to tell Rosemary's mother Barbara what has happened, only to find Rosemary herself staying there.

The three women go to see the body apparently belonging to Rosemary Boxer but find it is actually a female archaeologist called Gemma Jackson, who studied at he same university as Rosemary.

Deciding to use the problem of the dying plants at Engleton Park as a cover to find out what has been going on, Rosemary and Laura discover not all things are as they appear to be...

While Rosemary and Laura are helping to do up a garden for a Spanish tennis camp that is holding a tournament, in which Laura's son is taking part, tragedy strikes when the body of one of the Pro-Am tournament players is discovered. Although the player is thought to have died in a drunken accident, the gardeners soon find evidence that they were murdered, especially when the player's wife is killed in an accident intended for someone else. The pair soon realise that something is not right within the tennis camp...