As the second wave of coronavirus lockdown looms, we all need cheering, so ITV’s three nights devoted to a drama about serial killer Dennis Nilsen this week may be approached with trepidation.

Nilsen was found guilty of murdering 15 boys and young men between 1978 and 1983. The case still has the power to dismay us, being a perplexing tale of loneliness and inexplicable horror. Most of the victims were not even missed.

ITV’s series, starring David Tennant as Nilsen, who was known as Des, is not a lurid recreation of the crimes, however. It comes at the events from an unusual angle, which should make the drama fascinating.

Writer Brian Masters got close to Nilsen while he was behind bars, and this relationship is central to the drama. Masters wrote a classic account of his dealings with Nilsen, Killing for Company, using the killer’s own writings and poems in addition to their interviews to offer psychological insights into the man.

The book starts with a description of Muswell Hill, where Nilsen had been living when he was arrested. It looks at his Scottish background and slowly builds a portrait of this solitary but intelligent civil servant.

Masters also spoke to Nilsen’s mother and leading detectives on the case, and wrote a balanced and rare depiction of a strange, shocking predator.

In the drama, Masters, played by Jason Watkins, is exhilarated to be involved in writing up the case, but he underestimates the impact his new obsession will have on his life. The series considers the ethics of our interest in such figures.

Undoubtedly, these are dark events, but I don’t feel our inclination to watch such series is prurient. Our curiosity to understand how these crimes occur and who commits them is powerful.

But after each episode, I might switch over for some escapism and watch Battlestar Galactica.

Des, ITV, Mon-Wed 9pm