Instruct: Classify a review as either positive or negative.
Query: There are only four books in the Hitchiker saga.

Reality, friends, is what you and I make of it. So I'm going to make a solemn declaration: This book does not exist. The Hitchiker series ended with "So Long and Thanks for All the Fish," a bright, funny, well-written book.It did not end with "Mostly Harmless," which is the literary equivalent of an old man shouting "Here! Here's your darn book! Now leave me alone!" Adams is obviously tired of the series, and this book amounts to a middle finger to fans who begged for more. It's not funny, it's not smart, it's not that much fun to read. It doesn't take the series in any new directions; it exists only to finally shut up people who want another chapter in a finished series.It's not, all in all, a horrible book, just a monstrously disappointing one. Believe it with me, and we can make it so: SLATFATF was the last. There are only four. There are only four.