The phrase "follows book" can be substituted with a variety of synonyms depending on the context in which it is being used. Some possible options include "adheres to instructions," "complies with guidelines," "abides by protocol," "sticks to the script," or "implements the plan." Each of these phrases implies a sense of obedience or conformity to established rules or procedures, which may be necessary in certain professional or organizational settings. Using appropriate synonyms can help to clarify expectations and responsibilities, and ensure that everyone is on the same page with regards to a particular project or task.