4°C, clear, sunny, snow lingers.

Warwick Arts Centre, film:initially I thought this would be like a documentary, but it turned out to be a very powerful story that wove politics, sexuality, personal tragedy into a compelling story. It wasn’t all that long ago, significant events happened in the mid-seventies, years I can recall.

Please someone suggest what the thinking was behind this apostrophe. Not possessive, so it’s the missing letter game.
Can any scrabble experts suggest a word for thr_o. Anyone…?