Three more couples get hitched on Honeymoon Island and leap into their stranded life together. But while it's paradise for some of the honeymooners, one couple fail to ignite, and unwanted visitors threaten to derail another's early spark.

The time comes for one couple to flare out of Honeymoon Island, signalling the end of their relationship. Elsewhere, the couples swap partners for the day to gain some valuable insights into their marriages, resulting in a few fiery exchanges on their return.