Everything Zen? The family of Thai-born Siriyakorn ‘Bung’ Siriboon blame karma for the 13-year-old’s disappearance. She was abducted on her way to school in June, 2011.

Poona Dam Man: When an unidentified man took his own life beside a dam in Nambour, Queensland, he left behind a mysterious calling card which read, ‘Smile, have a nice life.’

Kind to Strangers: Adelaide counsellor, Christine Redford loved to help strangers in need. Did someone need her too much? She disappeared without a trace in 1998.

The Teeth Tell the Story: Forensic Odontologist, Dr Tony Hill has been identifying human remains by their teeth for more than 20 years.

Crouzon Syndrome: Police hope this cranio facial reconstruction can help identify Silvan Dam Man.

Dead in the Water: Silvan Dam Man was found floating in Melbourne’s water supply in 1989. Police are still trying to identify him but believe it's now safe to drink the water.

Silvan Dam Man’s Shoes: The Leopard brand runners were imported into Australia from Korea in the early 1980s. Know who wore them?

Lady of the Night: The body of a young woman, thought to be a prostitute, was buried in a Melbourne backyard. Are her breast implants the biggest clue to her identity?

Jamie Herdman and his beloved combi, ‘Edna’. Convinced that his past was catching up with him, the Kiwi traveller disappeared from Daly Waters in the Northern Territory in 2006.

The End of Everything: Childcare worker Raechel Betts lost her baby, her fiancé and her job. Then she met serial killer John Leslie Coombes and lost her life.

Not a runaway: In 1997 Bathurst teenager Jessica Small was kidnapped and probably killed, but for years no-one believed it.

New Leads: Detective Sergeant Peter Smith suspects Jessica Small’s abductor had local knowledge, so was he from around town?

Kinglake Central: A farmer thought he’d found a store dummy on his property, but soon realised the arms and legs weren’t plastic.

Stabbed repeatedly: The body of an unidentified man found in bushland at Kinglake West.

Perth’s Mystery Man: When a young man, dressed for the office, walked headlong into a speeding train, had he intended to kill himself? Police can’t say conclusively because they still don’t know who he is.

More than a John Doe: Senior Constable Jen Robinson and Sergeant Bert van der Woede at the grave of Perth’s Mystery Man. Jen organised a funeral service for the man whose family may not even know he’s missing. (Photographer: Gary Merrin/Newspix)

Clue Finder: Detective Senior Constable Mark Rippon was a member of Victoria Police’s highly successful Taskforce Belier, set up to match the missing and the dead.

Best of the Best: Detective Senior Sergeant Ron Iddles has worked on more than 260 murder investigations, with extraordinary results. He plans to find the body of Terry Floyd and bring his killer to justice.

Mother, Daughter, Prostitute: Laura Haworth was many things to many people so surely someone knows why she disappeared during Canberra’s Summernats car festival in 2008.

Tenacious: Senior Constable Karen Clarkson uncovered the identity of a missing sailor, Fred Marriott.

Remote Wooramel: Musterers stumbled upon Fred Marriott’s remains by accident when trying to retrieve an abandoned dinghy from the mud flats at Wooramel Station, 120 kilometres south of Carnarvon.

Mourned by a nation: The remains of 13-year-old Daniel Morcombe, once Australia’s most recognisable missing child, were found in the Sunshine Coast Hinterland in 2011.

Smiling, but united in grief: Gerry and Kate McCann, the parents of missing girl, Madeleine, met with Daniel Morcombe’s parents, Denise and Bruce, in 2011. They have become firm friends.

Stood Over: The body of this unidentified murder victim was found at a vehicle-testing area near the Melbourne suburb of Roxborough Park in 1995. Can you identify him?

Staged Disappearance? More than 40 years ago, wild child Tamara Milograd planned to disappear. Today she’d be approaching retirement, but her family’s convinced she’s still out there somewhere.

Success Story: Members of Victoria Police Homicide Squad and Taskforce Belier (L-R) Detective Leading Senior Constable Peter Towner, Detective Senior Sergeant David Snare, Detective Sergeant David Butler, Leading Senior Constable Helen Nugent, Detective Leading Senior Constable Allan Wood, Detective Leading Senior Constable Mark Rippon. Detective Senior Sergeant Ron Iddles is seated.