The Murder Room: P.D. James

When Dalgliesh is persuaded by an old friend to visit the Dupayne, a small private museum on the edge of Hampstead Heath, he has no idea he'll return one week later under very different circumstances. One of the family trustees has been horribly murdered and the team are called in the investigate a death which is fraught with complications. Even before the murder, the museum was in turmoil. A new lease was due to be signed and two of the trustees were determined to keep the museum open, the third equally determined on its closure. The museum is dedicated to the years 1919 - 1939 and one of the galleries, The Murder Room, displays exhibits from the most notorious cases of those inter-war years. And now a modern killer is copying the cases on display. All the trustees, staff and volunteers who work in the Dupayne have the means and opportunity. One of them has the ruthlessness to kill and kill again.