Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A great romance and a fun mystery...

The back of the book says:With a resolve as cold as steel and a thirst for vengeance, U.S. marshal-turned-Confidential-agent Conrad Burke tracked his quarry like a Wild West hero of old. Until the trail led to his downfall- the one woman he'd always loved. Marilyn Langworthy, billionaire's daughter- and after one reckless night, mother of Con's unborn child.His quest placed her in jeopardy. But although the mobster he sought took no prisoners, only Marilyn had the key to bring the man down. Now Con would move heaven and earth to keep marilyn safe...The romance was sweet and I really liked the characters. The mystery was a little farfetched but I don't read these books for realism.