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Welcome to your latest obsession. Robert Glenister stars in this intriguing thriller, about police investigating a ‘simple’ murder. When a GP is stabbed in a playground, everyone is shocked, but the killer is easy to trace.

Alarm bells are soon ringing, however, and it seems the police aren’t the only investigators – there’s a mysterious ‘ghost detective’ asking questions, too.

Throw in a suspiciously perfect witness, played by the ever-brilliant Lesley Sharp, and you’ll find your mind spinning off in all sorts of tantalising directions. As with most crime dramas, each of the police officers has a personal drama to deal with, too…