Australia's most baffling homicides and mysterious missing persons' cases are uniquely explored in this stunning true-crime book in which you the listener are invited to play armchair detective. Featuring 18 infamous cases, Unsolved Australia unearths a host of jaw-dropping new evidence via in-depth interviews with police, families and criminals. Along the way you'll meet the 'Unsolved Squad' - the humble heroes and dedicated experts involved in collecting and connecting clues.

The police force can be a tough place for a woman, but Detective Superintendent Deborah Wallace rose to the top with grace, humour and an iconic sense of style. In her incredible 36-year career with NSW Police, Wallace took on murderers and drug suppliers and dismantled the state's most nefarious gangs. Tenacious, perceptive and sharp, Wallace commanded a range of police crime squads, bringing order to the Wild West of 1990s Cabramatta and busting criminal bikie gangs with Strike Force Raptor until her retirement in late 2019.

Here I am: tall and broad, shaved head, had my nose broken three times fighting. Black suit, white shirt, the big city homicide detective. I've led investigations into serial killings, child abductions, organized crime hits, and domestic murders. But beneath the suit, I've got an om symbol in the shape of a Buddha tattooed on my right bicep. It balances the tattoo on my left ribs: Better to die on your feet than live on your knees. That's how I choose to live my life.

No one gets closer to Australia's craziest characters than 'Doc' Tim Watson-Munro, a criminal psychologist with 40 years' experience assessing the mad, bad and dangerous. In a riveting series of weird, funny and terrifying tales sure to thrill and chill true crime listeners, Tim reveals the warped minds behind crimes that shocked and intrigued Australia.  

Tara Costigan was the woman next door. A hard worker. Quick to laugh and easy to like. She was happy, confident, strong. A woman who always looked after herself and her kids. Close with her family and her friends, she was much loved. Then, in 2013, she met Marcus Rappel. A local tradie, he was charming and sincere, they dated and fell in love. That should have been the end of a happy-ever-after story. But for Tara, it was much uglier. And for her family it would be devastating. 

 On Friday, September 12, 2014, William Tyrrell - a playful three-year-old boy dressed in a fire-engine red Spider-Man suit - disappears from a quiet street in broad daylight. It's assumed he's lost in the nearby bushland, but despite an intensive search, he's not found, and police start to suspect he's been abducted. No trace of William - not a shoe, not a hair - has ever been found, but now is not the time to surrender. How can a little boy just vanish? We have to find him.

Melbourne's gangland war was an era dominated by murders, stings, hits, drug busts, corruption, and greed - inspiring best-selling books and even a popular TV series, Underbelly. It took the police a decade to curtail the violence and bring down criminal kingpins Carl Williams, Tony Mokbel, and their accomplices. When the police finally closed the case file, just how they really won the war, with the help of an unlikely police informer, would become a closely guarded secret and its exposure the biggest legal scandal of our time.

He is 29 years old and commits his horrendous crime alone. He is an underachiever, unskilled, doesn't have a regular job and he is now a mass murderer. What made Martin Bryant go on a brutal killing spree at Port Arthur taking the lives of 35 people?

In an incredible 25-year career as a homicide detective, Ron Iddles' conviction rate was 99 percent. Yet that only partly explains why Iddles is known to cops and crims alike as 'The Great Man'. Tough, inventive and incorruptible, stoic in the face of senseless horror yet unafraid to shed tears for a victim, Ron has applied his country cunning and city savvy to over 320 homicide cases - some of them the most infamous, compelling and controversial crimes in the nation's history. To the victims of crime, Ron is both a shoulder to cry on and an avenging angel.

This is the true story of Keith Banks, one of Queensland's most decorated police officers, and his journey into the drug scene as an undercover operative in the 1980s. In an era of corruption, often alone, with no backup, he and other undercover cops quickly learned to blend into the drug scene, smoking dope and drinking with targets, buying drugs and having dealers arrested. Very quickly, the lines were blurred between his identity as a police officer and the life he pretended to be part of. 

This is the story of Christopher Wilder: the surf-loving son of a decorated naval war hero born in the suburbs of Sydney, who became the most wanted man in America - a psychopathic serial killer who slaughtered more than 16 young women in the USA and is the prime suspect in the infamous Australian Wanda Beach murders. Wilder was handsome and charming, and time and time again he managed to convince beautiful young women that he was a fashion photographer looking to help them start a career in modelling. 

Christopher Berry-Dee is the man who talks to serial killers. A world-renowned investigative criminologist, he has gained the trust of murderers across the world, entered their high security prisons, and discussed in detail their shocking crimes. The killers' pursuit of horror and violence is described through the unique audiotape and videotape interviews which Berry-Dee conducted, deep inside the bowels of some of the world's toughest prisons.

As Australia's most distinguished criminal psychologist, 'Doc' Tim Watson-Munro has assessed over 30,000 'persons of interest' in some of the nation's most notorious court cases, including Hoddle Street gunman Julian Knight, corporate fraudster Alan Bond, Melbourne gangster Alphonse Gangitano and, in recent years, Australia's first terrorist convicts. But the front line of psychology is no place for the fainthearted. 

Glen Walsh and Steven Alward were childhood friends in their tight-knit working-class community in Shortland, New South Wales. Both proud altar boys at the local Catholic church, they went on to attend the city's Catholic boys' highs schools. Both did well: Steven became a journalist; Glen a priest. But when Glen discovered another priest was sexually abusing boys, he reported the offending to police. Just weeks before he was due to give evidence at a key trial against the highest cleric to ever be charged with covering up child abuse, Father Glen Walsh was dead. 

Joe Kenda investigated 387 murder cases during his 23 years with the Colorado Springs Police Department and solved almost all of them. And he is ready to detail the cases that are too gruesome to air on television, cases that still haunt him, and the few cases where the killer got away. These cases are horrifyingly real, and the detail is so mesmerizing you won't be able to turn it off.