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A gloomy true-crime drama starring Stephen Merchant will air on TV this evening.
A documentary called Four Lives reveals what happened to the people Stephen Port killed. In addition, Food Unwrapped's New Year's resolutions. Here are some suggestions on things to watch tonight.

Four Lives
9pm, BBC One
This is the first in a three-part drama about Stephen Port's four victims, whose rapist and killer Stephen Port was recently found to have committed infuriatingly massive police errors. While Sheridan Smith portrays Sarah Sak, a mother who authored a book on the events surrounding the murder of her little kid, Stephen Merchant takes on a dark character. To ensure that their tales were conveyed accurately, the show's producers talked with the relatives of the victims. This is the name of Hollie Richardson's daughter.

Food Unwrapped’s Healthy New Year
7.30pm, Channel 4
A special edition of the foodie science format is arriving at a time when many of us are reassessing our diets. Briony May Williams investigates why gluten-free items typically cost more, Jimmy Doherty considers the health advantages of chia seeds, and a look at raw dog food is included in the information buffet (for consumption by pets, not humans). Graeme Virtue is the author of this article.

Inside Dubai: Playground of the Rich
9pm, BBC Two
It's possible to "enjoy your fortune" in Dubai. Meet the utterly unlikeable Gaynor Scott, who lives in opulent estates in both Dubai and the Channel Island of Jersey. For others, Scott and her fellow expats in the Middle East's Monaco will be enticingly moreish. It's possible that some people will be instantly repulsed. HR

Party Island: Summer in Zante
10pm, Channel 4
Zante's young people's shenanigans for a bubbly hour? We can do it on this gloomy January Monday night, no problem. Two men arrive for a last-minute boys' vacation while Tom and Duncan, the owners of a bar known for its "dentist's chair," need the island to get back to business for the first of three episodes. HR

Art on the BBC: The Great Salvador Dalí
9pm, BBC Four
David Dibosa, an art historian, scours the BBC's archives to examine the relationship between television and artists, from Monet to Turner. Salvador Dali, a surrealist who utilized the medium to promote himself, is the first to be mentioned. Wong Henry

The Cabins
9pm, ITV2
This is the second season of a popular dating show, perhaps because it confines the couples to their cabins for the duration of the show. For the next 24 hours, they live together in log cabins and must determine whether or not they want to continue their relationship. However, because the cabins are now next to each other, they can now engage in friendly banter with other couples. In the words of Jack Seale