Virgin Media Three Saturday

An arson attack on the home of a talented artist leads to suspicions that the man's patron was to blame, while Greengrass has limited success running a B&B. Joe McGann guest stars

Jackie fights for justice on behalf of a trespasser shot on Lord Ashfordly's land, and Greengrass makes the most of his new job as a newspaper columnist

Maggie falls for a handsome new locum, Andy's bravery reconciles him with Gina, and Greengrass's bike hire business turns out to be seriously flawed

A parcel bomb claims the life of genius mathematician Adam Capstone, and as Lewis and Hathaway investigate, suspicion falls on the victim's spurned wife Elizabeth

Bear is distraught, while Robert is shaken and Nicola warns Kev off

Aaron finds what he is looking for, while Belle formulates a new plan and Bear is torn

Sam comes up with an idea, the police arrive in the village and Laurel begins to get excited about her date

Ray makes an order, while Nicola is suspicious and Sam gets caught out

Ray makes an order, while Nicola is suspicious and Sam gets caught out

Sam keeps a secret, while Ray cautions April and Dylan, and Bob is worried about April

One of London's wealthiest men invites Poirot to a bridge evening where the guests include crime writer Ariadne Oliver - and the host ends up dead. Zoe Wanamaker guest stars

Jann reminisces about Christmases past - including the good, the bad and the humiliating - as it becomes clear there is more than one way to holiday

In Sheffield, Dan is pushed hard by retired PR executive Jayne, who is looking to make a big return on designer handbags to help pay for her daughter's wedding

Louisa is shocked and Martin suspicious by the unannounced return of her father, while an unexpected caravan squatter thwarts Bert's dreams of making a quick buck

The experts appraise a divorcee's £185,000 necklace, a crystal-covered drum kit used on a Kylie Minogue tour, a widow's precious rings and a 7ft Terminator model

Perez must reassess the investigation following Jo's attack, the MIT sets its sights on Malone, while Tosh grows sceptical of Lars

Troubled by historical DNA evidence results, Perez has to face the fact that Duncan may have been involved in Lizzie Kilmuir's murder

A young man with learning difficulties tries to persuade his family to adopt an abandoned dog for Christmas. Drama, starring Noel Fisher, Bruce Greenwood and Linda Emond