This is a plot that's very popular right now- locked room thriller type on an island with no help to be seen till near the end. 

A reality show that didn't sound great honestly- 5  couples compete doing challenges with their SO but could basically swap partners if they felt like it.. but no one expects a big tropical storm that leaves the couples stranded.

You get the typical Lord of the Flies type plot ... One person decides they know better and makes decisions for the group that puts them at odds, starts fights, changes loyalties and dynamics. Then people start dying off one by one.
 
It did get very page turn-y at the end but no really big twists I thought.