The curtain comes down on Film Fest, but there's an encore of emotion still to come. The couples split into two groups and head off for days out on separate islands, unaware that castaways – some of whom are all too familiar – plan to gatecrash their parties.

The recent flare-up causes suspicion and speculation amongst the remaining honeymooners, and even some of the strongest couples start to feel the strain of stranded life. And at the Couples Cove Masquerade Ball, the arrival of an unexpected guest sends shockwaves through the group.