When your 18 year old son goes missing and there are no clear answers after a long period of time, you resort to any means necessary to find out what happened.
Zac's disappearance didn't just impact the family, it impacted those left behind in the community around them.
Head back to that weekend in 2016 when Zac went missing plus we visit the location where he was last seen.
Get to know Zac when we meet his family - his Mum Karen, brother Cody and his two younger sisters.
Zac Barnes went missing at the age of 18. That was 3 years ago. His family are still no closer to finding out what happened to Zac.