Trudie Jeanette Adams disappeared in the early hours of 25 June 1978 after attending a dance at the Newport Surf Life Saving Club, New South Wales, Australia. She left the event early before hitchhiking home, at which point she entered a vehicle on Barrenjoey Road and has not been seen since. Her disappearance sparked New South Wales' biggest missing person search at the time,^[3] attracted extensive and ongoing national media attention, and eventually a $250,000 reward.^[4][5]

Trudie Adams' parents and ex-boyfriend, Steven Norris, reported her missing on 25 June 1978 after she failed to arrive home from the dance.^[6] Although police initially believed that the car she entered was a green Kombi van, Norris, as the main eyewitness, stated that he saw her enter a light-coloured 1977 Holden panel van.^[7][8] Police who investigated the case originally cast suspicion on Norris. Eventually he was cleared, and suspicion widened to those involved in the drug scene.^[9]

In the days after the attacks, a number of female rape victims, who had been assaulted by two disguised men, began to report a series of then-unknown crimes to police. Investigators then suspected that Adams' disappearance was linked to the 14 now-known violent rapes that had occurred in the Northern Beaches between 1971 and 1978,^[10][11] and may also be related to an attempted attack on a hitchhiker earlier on the evening of Adams' disappearance.^[12] On 16 August 1978, a reward of $20,000 was offered by the New South Wales government,^[3] and over the years her suspected murder has been investigated by police four times.^[3][11]

• In 1992, the case was reopened based on a refocused interest in the possible involvement of the green Kombi van.^[13]
• In 2008, the reward was raised to $250,000 for information which would lead to the conviction of her murderer(s).^[14]
• In 2009, the case's prime suspect, a convicted drug dealer and sex offender known as Neville Brian Tween, who was identified by some of the rape victims, was finally interviewed by police regarding Adams' disappearance.^[11] Tween, who had also been a police informant,^[15] denied any involvement in the disappearance or the rape cases (despite circumstantial evidence) and died in 2013.^[16]
• In 2011, an inquest was held in order to further investigate the disappearance of Adams, which resulted in the Coroner declaring that Adams died of "homicide or misadventure."^[17]
• In 2018, interest in the case was reignited by the airing of the second series of the Australian crime podcast Unravel^[18] and TV documentary Barrenjoey Road.^[19][20] A number of non-reported crimes and previously unknown victims have also come forward due to the airing of the podcast.^[21]

• List of people who disappeared
• Highway One (film)