Instruct: Classify a given Amazon review as either positive or negative.
Query: Inadequate Potboiler

This is an effort to write a time travel novel with causal paradoxes as a prominent part of the story. This book is an expansion of an award winning novella and the stretch marks are obvious. The quality of writing and characterization are pedestrian. Books like this can be saved by a clever plot and application of causal paradoxes but the paradoxes are predictable and the plot is marked by the sudden appearance of super powerful aliens defending the structure of space-time. This type of Deus ex Machina device is poor. The author has also a rather poor grasp of 20th century history. In this book, a key event is the destruction of the dirigible Hindenberg with the circumstances of that event influencing the survival of the Nazi regime. This is a laughable idea and a very shaky foundation for the generation of an alternative pattern of history.