Watch Book of Monsters (2018) HD Full Movie Free on solarmovie.do. Watch Book of Monsters (2018) online free. Sophie's 18th birthday becomes a bloodbath when monsters descend upon her house and start to devour ...Sophie's 18th birthday becomes a bloodbath when monsters descend upon her house and start to devour the party guests. Sophie and her friends must rally together to send their party crashers back to hell.