A Coroner's set to rule in coming weeks on one of New Zealand’s most baffling missing persons cases.

John Beckenridge broke a court order to pick up 11-year-old stepson, Mike Zhao-Beckenridge, from his Invercargill school in 2015.

A week later, their car went over a cliff near Curio Bay, with no bodies found.

 ZB journalist Courtney Winter says the court's heard unusual texts from the pair, including one that stood out.

"From Mike to his mother: You do not care what I say, you do not deserve to be my mum and you certainly do not deserve my love."

LISTEN ABOVE

• 'Do not deserve my love': Concerning texts from boy who vanished with stepdad
• Coroner to decide if man and stepson who disappeared in 2015 are dead or alive
• One year on: Where is Beckenridge?
• Police working with overseas associates to track missing man John Beckenridge