That story is Penance, a dizzying feat of masterful storytelling, where Eliza Clark manoeuvres us through accounts from the inhabitants of this small seaside town. Placing us in the capable hands of journalist Alec Z. Carelli, Clark allows him to construct what he claims is the 'definitive account' of the murder - and what led up to it. Built on hours of interviews with witnesses and family members, painstaking historical research, and most notably, correspondence with the killers themselves, the result is a riveting snapshot of lives rocked by tragedy, and a town left in turmoil.

The only question is: how much of it is true?