After an ‘incident’ one wet Friday night, where Professor Andrew Martin is found walking naked through the streets of Cambridge, he does not seem to be quite himself. Food sickens him. Clothes confound him. Even his loving wife and teenage son are repulsive to him. He hates everyone on the planet, except his dog, Newton. What could possibly make someone change their mind about the human race…? Is it a case of a genius having a nervous breakdown, or is it perhaps an alien from outer space?..