Book Club made less $ 13.7 million when it was released and was reviewed by more than 94 reviewers on Rotten Tomatoes .
It went on to debut to $ 13.6 million , finishing third behind Deadpool 2 and Avengers : Infinity War ; 80 % of its audience was female while 88 % was over the age of 35. On review aggregator website Rotten Tomatoes , the film has an approval rating of 58 % based on 95 reviews , and an average rating of 5.6/10 .