A hotel’s worth of rich guests cut off by snow, a dead body, the mafia and some supernatural antics … there’s a banquet of melodrama to feast on in this soapy foreign-language series

The snow is crisp and even, up in the Italian Alps: how lucky the protagonists in the new Walter Presents series Stranded are to be spending Christmas at a four-star spa resort in the beautiful Vanoi Valley! The welcome is warm, the hot chocolate is decadent and the hotel building, bedecked with giant baubles, looks like a greetings card painting. But wait! Threatening music? Characters staring anxiously into space, because they clearly have a big dark secret? A guest in a witness protection programme, and another who recognises her as the witness in the forthcoming trial of his secret mafia brother? Attenzione! This Italian-made Green, Red and White Lotus might not be such a paradise. Bad stuff is about to go down.

Specifically, the bad stuff is several thousand tons of snow and the thing it’s about to go down is the side of a nearby mountain. One avalanche later and, with frozen rocks blocking the tunnel that’s the only access to the valley – which we know on account of someone driving through it earlier and remarking “This tunnel is the only access to the valley” – everyone in the hotel is stuck there for the festive season, cut off from the outside world. Who lives? Who dies? Who chills in the bar with a grappa and a plate of carne salada, patiently waiting for help to arrive? Nobody, is the answer to that last question – they’re all too busy with their shady hidden agendas.

Dispatches investigates this growing crimewave. Plus: it’s getting very hot in the kitchen for the MasterChef final. Here’s what to watch this evening

8pm, Channel 4
There are some real grinches out there: a parcel is stolen in Britain every seven seconds. Reporter Tir Dhondy is on a mission to get to the bottom of the crimewave by hiding tracking devices in parcels and following stolen ones to challenge who took them. He also learns how gangs target delivery vans as part of their business model and gets access to a major police operation. Hollie Richardson

Colin the Caterpillar gets a tasty revamp. Plus: Romesh Ranganathan raps in New York City’s Union Square. Here’s what to watch this evening

9pm, ITV1
Marks & Spencer’s product development team are nothing short of miraculous, especially when it comes to party food. This year’s festive treats include fish-and-chip-inspired canapes and a “Christmas cracker” Colin the Caterpillar (think the classic Colin, just jazzier). Plus, the bestselling classic panettone gets a fresh update. Hollie Richardson

The Clueless icon plays an aggressive lawyer in sinister series Irish Blood. Plus: Ant and Dec’s ridiculous new challenge show. Here’s what to watch this evening

9pm, Sky Witness

From Judi Dench’s very naughty tea with Kenneth Branagh to the Peep Show Bake Off special – including Olivia Colman! – here’s your definitive guide to the best holiday viewing. Bring it on

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Amber, George, Balvinder and Karen battle it out for a chance at the glitterball trophy. Plus: get in the spirit with some festive bangers. Here’s what to watch this evening

6.35pm, BBC One

A documentary about the cover-up of barrister John Smyth, who subjected more than 100 boys to abuse. Plus: Ellie Taylor’s standup special. Here’s what to watch this evening

9pm, Channel 4
This devastating two-part documentary details the crimes of John Smyth, a barrister involved in conservative evangelical Christian camps. Over the course of four decades, Smyth subjected more than 100 boys to horrific sexual and physical abuse. Why wasn’t he stopped? Witnesses, including his victims and his own children, speak about life in close proximity to this monstrous man – and about the cover-up that meant he never faced justice. Phil Harrison

This deeply moving documentary celebrates the lives of the three girls who were killed in an attack on their dance class last year – and becomes a miraculously powerful tale of turning heartbreak into hope

If losing a child is the worst thing, the very worst, that can happen to you, what must it be like to lose one in a tragedy that was national headline news? Alongside that insurmountable sadness comes the question of how to reconcile grief’s normally private, quiet bearing with the fact that your bereavement was a public event. Nobody would be blamed for staying out of sight, saying no to interviewers and documentary-makers, and holding the memories close. But in Our Girls: the Southport Families, we see how a loss shared can be miraculously powerful.

Nine-year-old Alice da Silva Aguiar, seven-year-old Elsie Dot Stancombe and six-year-old Bebe King were all murdered on 29 July 2024, when a man invaded a holiday dance class in Southport, Merseyside and attacked children at random. The programme does not linger on the horror, or speak the killer’s name: instead it begins by introducing us to the girls as their parents remember them. Alice “was magic, she was wonder … the best daughter we could ask for”; Elsie “was unforgettable … she taught us how to be a mum and dad”; Bebe “was pure joy: everything was in a dance, everything was in a song”.