Vera Season 4 ITV

Vera returned to ITV tonight with On Harbour Street, a story that began innocently enough with D.S. Joe Ashworth’s (David Leon) daughter gently trying to awaken a sleeping passenger on a train. It quickly became apparent that Margaret Kraszewski (Annabel Leventon) wasn’t going to wake up from this sleep. The pensioner had been stabbed, but how could such a crime have gone unnoticed on a busy commuter train?

The investigation got off to a slow start with Margaret’s known acquaintances at a loss to explain a motive for her killing. Eventually, Joe and Vera (Brenda Blethyn) crossed paths with a potential suspect — Dee Sinton — an alcoholic who’d just been thrown out of a shelter where Margaret volunteered. Dee didn’t have much of an opportunity to explain herself before she too wound up dead. Another murder? or an accident? I won’t...