Season 1 gains interest and generated intrigue even suspense and the fatalities grow.
As season 2 opens, it seems Fortitude the show itself may have died.
That thought just grows larger and by the end of season 2 we realise we should have laid a traditional wreath of flowers at its funeral in season 1 and left Fortitude fellowship there.
By season 3 watching has become punishing. A walk in the cold rain outside without an umbrella more rewarding.