The unopened letter and twenty sealed years
Jean Perdu's lover Manon left Paris without explanation and sent him a letter, which he refused to open for over twenty years; he sealed the room holding their memories behind a bookcase. When a new neighbor finds the letter and he finally reads it, he learns Manon had been dying and had asked him to come to her, so his protective avoidance cost him the chance to say goodbye and prolonged his grief rather than sparing him from it. Only then does he untie his book barge and travel south toward Provence to face what he had frozen.