TV tonight: a striking film about the late musician Beldina Odenyo

Her half-sister pieces together her demos for an album in this moving documentary. Plus: Bake Off lets the fans set the tasks in the tent. Here’s what to watch this evening

10pm, BBC Four In October 2021, a triumphant performance at Usher Hall in Edinburgh set the singer‑songwriter Beldina Odenyo on the path to great success. By November, she had taken her own life. She was 31. In this documentary , her half-sister Leah attempts to gather Odenyo’s demos into an album. It also considers the trauma she lived with, as well as the force of her music. Hollie Richardson

8pm, Channel 4 Bringing Nigella Lawson on board has proved a hit and now there’s another first for the show: a week of challenges set by fans of the show. Expect things to be even more chaotic than usual, as familiar faces enter the tent for the signature challenge and the bakers need to make wearable treats for the showstopper. HR

8pm, U&Drama Based on the lead character in Nevada Barr’s series of award-winning novels, Anna Pigeon is a straight-talking US national parks ranger who gets through each week with “work and wine”. And that work involves an alarming amount of crime‑solving. Her first case concerns the death of her colleague, and she doesn’t believe it was the result of a mountain-lion attack. HR

The Belfast cop drama, created by two former investigative journalists, is as riveting as ever in its fourth season, and we get answers to what happened after a gunshot in that cliffhanger opener. Meanwhile, Blackthorn station is marked for closure, poor wee Tommy is struggling with heartbreak and Grace gets (yet another) nasty bit of news. HR

9pm, BBC Three Scarlet, 26, is married with a young son. She’s also a sex worker at Mustang Ranch in Nevada, the sole US state where brothels are legal (at least, in some rural counties). While it’s presented as a safer and more empathic option for sex workers, they must nevertheless earn their keep. And, as Dooley discovers, some, including Scarlet, may be paying an emotional price. Ali Catterall

9pm, Sky One From family illness to fertility issues and her partner’s drinking, this new series about the Towie star is an unexpectedly frank and unvarnished affair. As we reach episode six, will a change of scenery help Gemma to make some difficult decisions at this “pivotal point” in her life? Hannah J Davies