Protagonist has a disfigured smile which other characters find sinister, but he is in fact sweet and vulnerable.
The plot of the book turns on a mystery where someone appears to have been murdered being pushed out of a window.
Most of the book is a flashback of the protagonist’s time at a grim boarding school in Scotland (based on Gourdonstoun perhaps ?) where he is bullied relentlessly and attacked on a cross country run, leaving him with lifelong injuries to his hand.
Later, after the person has fallen from the window to their death, the protagonist is in an institution in the 70’s or ‘80’s for the criminally insane. I think he was blamed for the death. He is administered drugs and finds it hard to communicate when he has an opportunity to speak to a trust worthy character who comes to find out the truth about the death by defenestration.
What was the book??!!
thank you 😃