ENTERTAINMENT Murder Island

Channel 4, 9.30pm

Ian Rankin (above) is one of the most popular crime writers around thanks to his bestselling Inspector Rebus novels. He's now putting his ability to create mind-boggling mysteries to the test by devising a fiendishly tricky murder plot, before challenging members of the public to solve it. They have a week to do so, with the winners taking home a cheque for £50,000. ★★★★★