Swords Into Ploughshares

Why was Gemma Jackson posing as Rosemary Boxer to gain access to Engleton Park before she was found dead, and why has the once perfect Engleton garden become so blighted that it can no longer be open to the public? Lord Engleton's connection with the local archaeology department means that Rosemary and Laura must look back in history to find the source of the garden's problems. Anglo-Saxon artifacts hold the clue but when Richard Earle, working on the same archaeological site as Gemma, is also murdered, the gardeners realize that someone is willing to pay a very high price for a piece of British history.