Mel draws on her frankly non-existent knowledge of geoglyphs and the technology behind GPS to tell Josie all about the mysterious Marree Man, a 2.7km bloke drawn in the South Australian desert by person - or persons - unknown.

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Continuing with their accidental water theme, Josie talks Mel through the case of "Rack Man", a body found tied to a metal cross in NSW's Hawkesbury River in 1994.

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This week, Mel takes Josie through the murder of 15-year-old friends Marianne Schmidt and Christine Sharrock at Sydney's Wanda Beach, a case which has remained unsolved for 53 years.

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Josie takes Mel through a recent case -- the weird road trip taken by the Tromp family, which resulted in a missing persons report, a stolen car and theories of a rare shared delusional disorder being the cause of the whole thing.

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Mel, who has no working knowledge of boats or sailing, decides to present a boat / sailing related mystery to Josie -- the case of the Patanela, a yacht that vanished off the coast of Sydney in 1988.

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Josie takes Mel on a deep dive into the curious case of Australia's missing Prime Minister, Harold Holt, who went for a swim in 1967 and was never seen again.

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Mel tells Josie all about the grim history of Australia's most haunted house - Monte Cristo Homestead. Did it's owners commit heinous crimes against their servants? And is the homestead now riddled with ghosts as a result?

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Newcastle native Josie takes Mel through the local case that she's never forgotten - the abduction of 16-year-old Gordana Kotevski in 1994.

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Mel tells Josie all about the Luna Park Ghost Train fire of 1979, including the wild theory that a demon was partly responsible for the tragedy.

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Josie takes Mel through one of Australia's strangest and most famous mysteries - after 70 years, no one has been able to identify the dead man found on Adelaide's Somerton Beach on Dec 1, 1948.

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Josie on Instagram: @josieroze

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