Fred convinces his partner Nel to celebrate her fortieth birthday on an Arctic cruise, and it's only natural to invite along some friends, despite promising to keep it quiet.

But nobody had counted on the presence of Fred's Scrabble-crazy aunts and their frenzied power walking up and down the top deck, or on Marvin, a climate change-denying American oilman with a few card tricks up his sleeve, or an eco-protest for that matter. And certainly no one had expected to spot a ravenous polar bear...

With old flames and familiar faces aboard, and an imposter in their midst, will they all make it through the ice and back? And as the temperature rises, will they keep their cool?