TV tonight: a Welsh crime drama that’s perfect for winter | TV and radio

Under the salt marsh

9pm, Sky Atlantic
A thrilling crime drama that makes the most of its rugged South Wales coastal backdrop, complete with sheep running through the pub and cozy sweaters. Yellowstone’s Kelly Reilly leads the (not entirely Welsh) cast as Jackie, a pensive detective turned guru with perpetual hair in bed. When she finds her student’s body in a ditch, her former colleague Detective Eric Paul (Rafe Spall) arrives on the scene, still upset by the cold case that forced Jackie to leave the force three years ago. Are the two crimes related? Add to the mix an impending deadly storm and Jackie’s secret lover played by Harry Lawty, and it makes for perfect winter TV. Holly Richardson

Monte Don Rheinland Gardens

7pm on BBC Two
Monty’s tour of the gardens along the Rhine was driven by emotion. As Holland enters the final episode, he continues to meet people whose enthusiasm matches his own. Explores the river’s influence on Dutch life and visits the world’s largest tulip display. Phil Harrison

David Baddiel: Cat Man

8pm on Channel 4
It’s the charming series finale that sees the comedian questioning why dogs haunt the airwaves. Badiel meets adorable little animals who saved their owners’ lives. Additionally, it glorifies the idea that cats are great pets for men. Or as one interviewee said: “A man with a cat is a more rounded person.” Alexey Duggins

Masked Devil: John Wayne Gacy

9pm on ITV1
An utterly dark drama based on John Wayne Gacy, a “pillar of society,” who dressed as a clown to entertain sick children — but killed 33 young men and boys and buried them under his house. Showrunner Patrick McManus promises the victims are at the heart of the show, but it begins with the days leading up to the horrific police discovery. Human resources

Death in heaven

9pm, BBC One
Selwyn (Don Warrington) has just landed at St Mary’s when there is another death to investigate. A man fell from the roof of Government House, but did he jump or was he pushed? DI Mervyn Wilson (Don Gillette) is on the case, albeit a little distracted by meeting his long-lost half-brother. Ellen E. Jones

The Graham Norton Show

10.40pm, on BBC One
Some of Hollywood’s hottest stars — Halle Berry, Chris Hemsworth, and Rachel McAdams — are gathered on Graham’s red sofa this week, ready to drop some tidbits. Plus, John Bishop discusses the film based on his life and directed by Bradley Cooper. Human resources

Choose a movie

The Naked Gun (2025, Akiva Schiffer).), 9.10am, first showing at Sky Cinema
If you like silly comedies and stuffed beavers, good news: a reboot of last year’s well-received law enforcement farce is coming to TV in the UK, now starring Liam Neeson as Lt. Frank Drebin Jr., the son of Leslie Nielsen’s original character. When a “stat of toughness” device (or “conspiracy device,” for short) is stolen from a safe deposit box, Drebin teams up with crime novelist Beth (Pamela Anderson) to thwart the bad guys — as well as a nasty snowman — and restore order to the streets of Los Angeles. Eig