Rope's End, Rogue's End — E.C.R. Lorac

Wulfstane Manor, a rambling old country house with many unused rooms, winding staircases and a maze of cellars, had been bequeathed to Veronica Mallowood and her brother Martin. The last time the large family of Mallowoods had all foregathered under the ancestral roof was on the occasion of their father's funeral, and there had been one of those unholy rows which not infrequently follow the reading of a will. That was some years ago, and as Veronica found it increasingly difficult to go on paying for the upkeep of Wulfstane, she summoned another family conference - a conference in which Death took a hand.  Rope's End, Rogue's End  is, of course, an Inspector MacDonald case, in which that popular detective plays a brilliant part.