Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Unique Story ... solid characters

Improbable is a very good title for this novel since the story itself definitely falls into the category of improbable, if not impossible.David Caine is a master of numbers, one of a set of identical twins. His brother is, to put it in common usage, off his rocker. However, when Caine is forced into an experiment that involves a drug, he begins to see the mathematical possibilities of the present and future. In so doing, he begins to realize that his brother has seen these possibilities and that is a part of his ramblings.However, as various groups compete for control of this experimental drug and for David Caine himself, he is faced with great danger in his own personal life.A very good read, with many unexpected twists and turns.