The Bogle-Chandler case refers to the mysterious deaths of Dr. Gilbert Bogle and Mrs Margaret Chandler, whose bodies were discovered on the banks of the Lane Cove River in Sydney on January 1, 1963. The pair had attended a New Year’s Eve party together in nearby Chatswood, before driving to the Lane Cove River, which was a well-known lover’s lane. What happened next is unclear, but several hours later, their semi-naked bodies were found on the river bed. Autopsies offered little clue as to how the couple died, only that there were signs of a rapidly acting poison. Despite assistance from the FBI and Scotland Yard, the poison was never identified. At the end of a long and controversial coronial inquest, no cause of death, killer or motive could be identified. In the ensuing years, scores of tabloid theories were put forward, from LSD to Cold War assassinations – but in the minds of many, including the police, Mrs Chandler’s husband, Geoffrey Chandler, was the likely culprit. In 2006 documentary filmmaker Peter Butt claimed to have solved the 43 year old mystery. Butt uncovered compelling evidence to suggest Bogle and Chandler had been killed after breathing in deadly quantities of odourless hydrogen sulphide gas, which had erupted from the polluted river bed.