Rising Tides — Susan Kiernan-Lewis

The tides are definitely rising in Book 5 of the Irish End Games. This is the story of two desperate journeys to find lost loved ones culminating in a shocking discovery -- one with the power to destroy all of Europe. Mike and Sarah, searching for both John and Gavin in every bungalow and hillock in Ireland in the midst of a mysterious world plague, instead find the stuff of every parent's nightmares.