On Anzac Day 1935, visitors to an aquarium in Sydney witness a grotesque spectacle as a massive tiger shark vomits up a severed arm. Whose arm is it? And how did it end up inside the shark? These are just some of the questions facing Detective Sergeant Matthews of Sydney’s Central Intelligence Bureau. When the victim is identified as a man called Jim Smith, Detective Matthews realises he knows him. Not only that, he may be the reason Smith was killed.  A Noiser production, written by Roger Morris. For ad-free listening, exclusive content, and early access to new episodes, join Noiser+. Now available for Apple and Android users. Click the Noiser+ banner on Apple or go to noiser.com/subscriptions to get started with a 7-day free trial. Learn more about your ad choices. Visit megaphone.fm/adchoices