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...

Rosemary and Laura are re-planting historic Regent's Park, which is hampered when they find plants being stolen shortly after being planted. While trying to determine who is stealing them, they soon find themselves dealing with a murder when an Eastern European doctor is found shot dead, while walking a three-legged dog. It's not long before the pair unearth secrets in the park, and begin suspecting the doctor might not have been the intended victim, when his colleague, the dog's owner, is soon shot themselves...