I simply don't understand the whole lodger story and whether it has any basis in fact. If Tumblety was the lodger why would he be so dumb as to leave a bag of incriminating evidence in his room and ask his landlady to wash a blood soaked shirt? And even more importantly, when he was in custody for gross indecency why wasn't his landlady brought in to identify him? Didn't the police have the lodger's name and description by then? All very confusing.