A well done 4 parter, despite many omissions.
But I read that many things had to be omitted , just to fit into the allocated time. But surely even 1 line of dialogue would have sufficied instead of omission.
No mention of how the murderer got hold of psychotics, or why medics would not test for psychotics on first reports of symptoms.
The weakest part for me was the portrayal of the start of the fake relationship between the murder and first victim, quite not credible , although later parts of the script partly explain.
Unclear exactly how the murderer had some hold or influence over Martyn Smith.
One puzzling thing. What is the significance of the many shots of the clock tower, and tolling bell, in the last two episodes. Wasted moments maybe could have been used for wider dialogue about the omissions.
Strong performance by all the leads, and Éanna Hardwicke is positively creepy in this role, even down to the manufactured accent, which only slips in one few-seconds scene.
Marvellous to see Anne Reid, Timothy Spall, Sheila Hancock giving their all.