Researcher Gina Gray is on the verge of a breakthrough in sonar technology, but she fears that her impending discovery will only put the lives of those she loves in greater danger.

Undetected 2014, Bethany House Publishers, Grand Rapids

ISBN-13: 9780764212437

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Undetected 2014, Bethany House Publishers, Grand Rapids

ISBN-13: 9780764212444

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Undetected 2014, Thorndike Press

ISBN-13: 9781410468154

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Undetected 2014, Christian Large Print, MI

ISBN-13: 9781594155055

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