This is a choose-your-own-adventure book, it is a training exercise for the Night Office, an organization that fights otherworldly and extra-dimensional monsters. This is a training exercise. In this exercise, the reader is transported to a coffee shop where they are to identify an existential threat to humanity.
You will die, maybe you will walk away. But can you survive the mission? I found the adventure fun, playing it several times to explore different paths through the book. It can be run through in about 15 minutes to complete most paths. It will still get read from time to time. Now I need to get another book in the series, this is the cheapest and smallest so I anticipate more complex stories.