The final episode is a let down after two very solid first thirds, but even so, this is an enjoyable reimagining of the classic tale. As a result of the somewhat lacklustre third part, it doesn't in my opinion quite live up to Moffat's two excellent previous Victorian classic remakes ("Jekyll" and "Sherlock"), but it's well worth the watch. Dolly Wells is particularly memorable as Sister Agatha Van Helsing.