Would she be able to prove that Pye Hall was hers? Suppose the detective inspector was right? All she had were the words of a sick and dying man with no witnesses present in the room, no proof that he was actually sane when he spoke them. A legal case resting on twelve minutes that had ticked by more than fifty years ago.
Still don't quite understand why Dr Redwing isn't a witness to this confession: she was there. Because you need someone witnessing it being told to someone (so Redwing can't just make it up)? Or because she was Rennard's daughter?