It's the Greatest Show on Earth! Backstage, of course! Coincidentally, our Musical of the Week is 'Barnum' — all about the man who used that cachphrase for his own entertainment empire, PT Barnum. And we have a yarn about those who aren't necessarily theatre-doers but who still like to particpate as theatre-goers... and a bit about Agatha Christie's ageless mystery thriller, The Mousetrap.