Has this series – starring Robert Glenister and Lesley Sharp – finally lost the plot?

There’s a murder investigation under way and Nina is behaving like a lovesick teenager, throwing her toys out of the pram every time Alec says hello to another woman.

What does he see in her?! Desperate for breathing space, Alec goes rogue and sets up a meeting with the ghost detective. Surely that can’t end well?

Meanwhile, Bobby is working with a bizarre double act of German detectives, but is soon wishing he’d stayed at home.