PBS

Not every show is a home run right out of the gate. The new mystery series Ridley has real growth potential after airing all episodes of Season 1. However, there are places where it could stand to tinker with the format.

With the passing of the torch from Nicola Walker's DCI Cassie Stuart to Sinéad Keenan's DCI Jesse James, here's everything to remember about Unforgotten's previous episodes ahead of Season 5's debut.

The full trailer for World on Fire Season 2 takes viewers from England to Africa and everywhere in between.

Hotel Portofino Season 2 will return to PBS, and the check-in date coincides with the arrival of Season 2 for two other fan favorites.

Season 1 of D.I. Ray has all the comfortable hallmarks of a classic police procedural, plus a fresh perspective and a compelling protagonist. That said, it also has plenty of room to improve. 

PBS has set a broadcast date for Once Upon a Time in Northern Ireland, a unique five-part film exploring the decades-long conflict known as "The Troubles.”