From Longman Dictionary of Contemporary Englishbe in somebody’s good booksbe in somebody’s good booksinformalLIKE somebody OR something if you are in someone’s good books, they are pleased with you or your work I’ll ask my boss for the day off – I’m in her good books just now. → good
Examples from the Corpus
be in somebody’s good books• I think I'm back in Corinne's good books again. 