Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Started slow, but finished well

'Enigma' is a story of intrigue that takes place at Bletchley Park during the Second World War. There are two main storylines: cracking the enigma code before a shipping convoy is destroyed, and discovering the motives and intentions of the mysterious Claire Romilly.Both these storylines revolve around the main character, Tom Jericho, a cryptanalyst working on breaking the german naval enigma code.'Enigma' starts off very slowly, and after 90 pages, I was about to put the book down and move on. However, Harris really starts getting to the heart of the action about this time, and the book really takes off. Perhaps he could have condensed the first 90 pages and made this book five stars, but taken as a whole 'Enigma' is quite entertaining.If you enjoy books about wartime codebreaking, you will definitely want to read this book. If you read and enjoy 'Enigma', you should check out Neal Stephenson's 'Cryptonomicon.'