Cardinal: By the Time You Read This, BBC4, 9pm & 9.40pm

AS Billy Campbell’s Canadian detective returns for a third series, we find him struggling to truly accept that his wife Catherine succumbed to her battle with manic depression and took her own life. And Cardinal’s doubts are only reinforced when he starts to receive a series of anonymous greetings cards blaming him for her death. Delorme steps in to take the lead at work, and the pair soon find themselves investigating a murder case in Algonquin Bay. The bodies are missing and a witness to the crime is being stalked by the killer.

Queen Victoria: My Musical Britain, BBC2, 9pm

ON May 24, it will be 200 years since Queen Victoria’s birth and historian Dr Lucy Worsley is doing her bit to mark the event. Not only is she presenting the Radio 4 series Encounters with Victoria, she also hosts this documentary which explores the monarch’s character and legacy through music. Worsley will look at how the queen used music to transform the monarchy from a political power into a cultural force that aimed to unite the United Kingdom and Ireland during a time of great upheaval – and cement its power. The historian also explores the role music played in Victoria’s life, and there will be performances from Sir Willard White, the BBC Symphony Orchestra and the Black Dyke Brass Band.

Ninja Warrior UK, STV, 6.30pm

COMPETITORS test their strength, speed and courage in the semi-final of the obstacle-course challenge, hosted by Ben Shephard, Rochelle Humes and Chris Kamara. Those who make it to the end of the adrenaline-fuelled mission face one final task – scaling the heights of a tower named Mount Midoriyama – as they battle it out for the title of Ninja Warrior UK.

Britain’s Got Talent, STV, 8pm

ANT and Dec host the 13th series of the nationwide talent search, joined by judging panel Simon Cowell, Amanda Holden, Alesha Dixon and David Walliams. An assortment of acts from across the UK will be displaying their talents, hoping to win the grand prize of £250,000 and the opportunity to appear at the Royal Variety Performance.

Bradley Walsh’s Late Night Guest List, STV, 9.15pm

DO you remember The Nightly Show, STV’s attempt to launch a new chat show with a different guest host each week? It seems few people do, but while that format got a mixed response, Bradley Walsh’s stint in charge clearly convinced the viewers and STV that he is just as adept at rubbing shoulders with celebrities after the watershed as he is at asking members of the public questions at tea time on The Chase. So, he has been given the reigns for this new one-off show, in which he’s joined by celebs for a variety of games.