In 1978, Evan Pederick, a naive 22-year-old in the thrall of a radical religious movement, Ananda Marga, placed an enormous bomb outside Sydney's Hilton Hotel. It killed three people.

A decade later, Pederick confessed to this act of terrorism. But when one of his alleged accomplices was later acquitted, significant parts of Pederick's testimony were undermined and he was accused of being a 'fantasist'.

Conspiracy theories flooded in to fill the vacuum. Was it a plot by ASIO, rather than, as Pederick asserted, a plot to assassinate the Indian prime minister? In the absence of a Royal Commission or similar inquiry, mystery continues to shroud the deadliest terror attack on Australian soil.

Pederick, an Anglican priest, stands by his confession and testimony. Here is his story, told for the first time.

It is an extraordinary tale of guilt, remorse, renewal, and the search for forgiveness.