1977, Collingwood. Two young women are brutally murdered and the killer is never found. What happened in the house on Easey Street?

On a warm night in January, Suzanne Armstrong and Susan Bartlett were savagely murdered in their house on Easey Street – stabbed multiple times while Suzanne's sixteen-month-old baby slept in his cot. Although police established a list of more than 100 'persons of interest', the case became one of the most infamous unsolved crimes in Melbourne.

Journalist Helen Thomas was a cub reporter at The Age when the murders were committed and saw how deeply they affected the city. Now, forty-two years on, she has re-examined the cold case – chasing down new leads and talking to members of the Armstrong and Bartlett families, the women's neighbours on Easey Street, detectives and journalists. What emerges is a portrait of a crime rife with ambiguities and contradictions, that took place at a fascinating time in the city's history.

Why has the Easey Street murderer never been found, despite a million-dollar reward still being offered forty years later? Did the women know their killer, or were their deaths due to a random, frenzied attack? Could the murderer have killed again? This gripping account addresses these questions and more as it sheds new light on one of Australia's most disturbing and compelling criminal mysteries.

Helen Thomas has been a journalist for more than forty years. In 2005, Thomas spent months researching the Easey Street murders for Radio National's Background Briefing, shedding new light on the investigation. She is the manager of ABC News Radio and author of five books, including Moods: The Peter Moody Saga.