Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A puzzling work of SF

I looked forward to "Door Number Three" after reading the jacket cover. I like SF that plays on issues of time and alternate realities and the like. This book was not at all what I hoped for. Mr. O'Leary writes well and fluidly. His story has a staccato quality that must attempt to highlight the discontinuities of reality that he explores. For me, the result was a book that was difficult to "get into." The main character is appealing. This was not the case for the others, including the mysterious woman from an different plane of reality. The ideas are interesting, and the writing is crisp. The story execution falls short, however.