I Never Regretted Leaving You
Actually, when Thea told him that Uma was the most suspicious murderer, Sir Harris thought Thea's idea was absurd.
But Thea's reasons were also very valid, “Sir Miller was killed in a locked room, and since there were no traces of outside intrusion, it boldly suggests that the murderer was hiding inside the room. And Uma, who lived with Sir Miller, is the prime suspect. As for those inexplicable reasons, it is because the killer erased the evidence."