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 2015, Brilliance Audio

ISBN-13: 9781480596658

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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, Brilliance Audio

ISBN-13: 9781480596665

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Undetected 2014, Christian Large Print, MI

ISBN-13: 9781594155055

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Undetected 2014, Brilliance Audio

ISBN-13: 9781480596627

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