Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Powerful -- Very highly recommended

...Author Ramon Harris pens a gripping tale in ALLEGRO'S SECRET. As the idealism of youth gives way to disillusionment and grief, Al grows from innocence to bitterness, yet even his traitorous acts never place his team in danger. The radical personality changes that accompany his horrible accident provide a poignant, sympathetic note to the novel as well. In addition, his ambitious girl friend and later wife Mandy creates a powerful presence in the novel. Secondary characters likewise will capture the reader's attention, including those with whom he served and those who led them. A carefully crafted, powerfully rendered, tension filled read that's impossible to put down, ALLEGRO'S SECRET comes very highly recommended.