title: The Shark Arm Murders: The Thrilling True Story of a Tiger Shark and a Tattooed Arm
author:  Alex C. Castles 
description: This true story of one of the world's great unsolved murder cases begins one quiet Anzac Day when a giant Tiger shark, on display in the Coogee public baths, coughs up a tattooed arm. What follows is a spellbinding tale of detection in the 1930s Sydney underworld. Author Alex Castles, a professor of law and a graduate of the University of Chicago, thinks he might know the solution to a riddle that has baffled police and scientists for decades.
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  **Patrick C. Walsh**
  
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  **The Tiger’s Back**
  
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  _**The ninth Mac Maguire mystery**_
  
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  Garden City Ink
  
    
  
  A Garden City Ink ebook
  
  [_www.gardencityink.com_](http://www.gardencityink.com)
  
  First published in Great Britain in 2019
  
  All rights reserved
  
  Copyright © 2019 Patrick C. Walsh
  
  The right of Patrick C. Walsh to be identified as the author of this work has
  been asserted in accordance with Section 77 of the Copyright, Designs and
  Patents Act 1988.
  
  No part of this publication may be reproduced, stored in a retrieval system,
  or transmitted, in any form or means, electronic, mechanical, photocopying,
  recording or otherwise, without the prior permission of the copyright holder.
  
  All characters in this publication are fictitious and any resemblance to real
  persons, living or dead, is purely co-incidental.
  
  A CIP record for this title is available from the British Library
  
  Cover art © Patrick C Walsh 2019
  
  Photo credits - Erman Kayaalp (Tiger 