When the race heads to beautiful Istanbul, some teams turn on each other while others turn on workmates Paul and Steve.

An apparently simple market challenge will test the patience of every team. And an ancient treasure could be the undoing of one pair of race favourites.

Watch how the stress of the race causes a huge argument between James and Sarah in our exclusive leaked footage from Episode 5. Is this the end of the line for their rocky relationship?

If you have missed any episodes so far, catch up now and watch the teams journey so far.

The Amazing Race Australia moves to the new night of Monday, 7.30pm on Seven.