I read this because its prequel Fifty Shades of Grey ended on a big cliffhanger. It was no improvement from the former. Needless to say, I will not be reading the third.
Ana and Christian are both miserable being away from each other. Christian suggests a new arrangement - a real relationship without the BDSM - and Ana agrees. Ana starts at her new job and her boss Jack keeps trying to crack onto her. Christian take over the firm that Ana works for and fires her boss. He proposes to her and she has no answer. They go to his psychiatrist and beforehand Ana hands him a present to be opened on his birthday. His psychiatrist elaborates on why Christian is so messed up. Then one day, Christian stops replying to Ana's emails. His plane crashed and he had to hitchhike home - leaving Ana and his family worried for his life. Turns out Ana's boss sabotages his plane. They go to his birthday bash and Christian opens his present from Ana - a keyring that flashes the word 'YES.' She gave it to him beforehand to show that nothing she found out about him would stop her loving him.