The dead in their vaulted arches

The presumed death of Harriet de Luce in a mysterious mountaineering accident in Tibet while Flavia was only a baby cast a sombre shadow over the family, leaving Colonel de Luce a broken man and Flavia herself with no memories of her mother. But now, astonishingly, a specially commissioned train is bringing Harriet back to Buckshaw. But rather than putting the past finally to rest, Harriet's return is set to trigger a further series of bizarre and deadly events, as a most curious group of individuals converge on Buckshaw to pay their respects.