Dark Heart
9pm, ITV
Viewers may remember the opening two parts of this series from Unforgotten writer Chris Lang, as they aired together as a feature-length pilot in 2016. The drama follows the work of DI Will Wagstaffe (Tom Riley) and his team as they investigate a gruesome murder, soon discovering that the victim was arrested two years ago on suspicion of sexually assaulting his stepdaughters. Is his death a straightforward revenge killing, or something more sinister? A quality thriller, it also stars Charlotte Riley and Miranda Raison. Continues tomorrow. Mike Bradley
The Secret Life of the Zoo
8pm, Channel 4
In the conspicuous absence of any other good natural history programming, a new series of the strand that monitors events at Chester Zoo is to be welcomed. This week’s theme is reproduction: Asian elephant Thi is two months overdue; giant anteaters Bliss and Oso get busy; and clownfish Polo changes sex. MB
Trust
9pm, BBC Two
We’re in Godfather territory as, on the day of his son’s confirmation, Leonardo welcomes – if that’s the right word – Don Salvatore to his home. Trouble lies ahead. A superbly scripted episode that explores issues around manhood, losing face and the pull of seemingly predetermined roles in our lives. Jonathan Wright
The Secret Story of Stuff: Materials of the Modern Age
9pm, BBC Four
Look past the ungainly title and what we have here is a remarkable glimpse at new advances in material science. Among the innovations shared by engineer Zoe Laughlin are indestructible dental crowns and a carbon-neutral textile made from pineapple leaf fibres. MB
Ray Donovan
9pm, Sky Atlantic
At the end of season five, we saw Ray, led by Abby’s ghost, take a plunge from a ledge into New York’s East River. In season six’s opener, he is pulled from the water by a kindly police officer, with whom he bonds. It could be the start of his rebuilding – but a call from Sam pulls him back from a new life. David Stubbs
Celebrity Road Trip: Lost in Transylvania
9pm, 5Star
More pointing and laughing at celebrities, as Made in Chelsea’s Mark Francis, Towie’s Bobby Norris, Love Island’s Chris Hughes and Big Brother housemate Dan Osborne visit Bucharest to learn the truth about Count Dracula. Expect their knowledge of eastern European history to be patchy at best. Phil Harrison
Film choice
The Witch (Robert Eggers, 2015), 9pm, Film4
In 17th-century New England, a devout father (Ralph Ineson) rebels against the puritan elders and leads his family to set up home beside a forbidding forest. The torment that follows in Robert Eggers’s eerie little horror centres on the pubescent daughter (Anya Taylor-Joy), in a tale that springs out of the darkest folklore. Paul Howlett
Today’s best live sport
Snooker: International Championship 6.25am, Eurosport 1 Day four from Daqing, China.
Tennis: The Paris Masters 10am, Sky Sports Main Event The AccorHotels Arena hosts the men’s tournament.
Scottish Premiership football: Hearts v Hibernian 7pm, BT Sport 1 Edinburgh derby. Dundee v Celtic airs at 7.30pm on BT Sport 2.
