Exposing a dirty secret – how some churches still practice a form of gay conversion therapy; plus, the daddy of all boy bands, the Backstreet Boys make a triumphant return; and a major victory for Jeni and her army of 2000 personalities.

A 60 MINUTES Exclusive: The police sniper who saw everything at the Lindt Café siege in Sydney tells Liz Hayes why he didn't pull the trigger to shoot the terrorist who'd taken 18 innocent hostages, & the regret he's lived with ever since.