Portugal

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The Arm of the Starfish (O'Keefe Family, #1)  by Madeleine L'Engle 

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When Adam Eddington, a gifted marine biology student, makes the acquaintance of blond and beautiful Kali Cutter at Kennedy International Airport on his way to Portugal to spend the summer working for the renowned scientist Dr. O'Keefe, he has no idea that this seemingly chance meeting will set into motion a chain of events he will be unable to stop. Caught between Kali's seductive wiles and the trusting adoration of Dr. O'Keefe's daughter, Polly, Adam finds himself enmeshed in a deadly power struggle between two groups of people, only one of which can have right on its side. As the danger escalates, Adam must make a decision that could affect the entire world--which side is he on?