" And they are a partnership. I can see it, I know how they are. His strength, that protectiveness he radiates, it doesn’t mean she’s weak. She’s strong in other ways; she makes intellectual leaps that leave him openmouthed in admiration. She can cut to the nub of a problem, dissect and analyse it in the time it takes other people to say good morning. At parties, he often holds her hand, even though they’ve been together years. They respect each other, they don’t put each other down. "

― Paula Hawkins , The Girl on the Train