The Macguffin — Michael Craft

A cold-case murder fifteen years ago halted promising developments in the quest for clean energy when the rumored prototype of a groundbreaking water engine was stolen or destroyed. Now the race is on to repower America, and Cooper Brant, still grieving that long-ago murder of his father, suddenly finds his family visited by a second violent death, raising the stakes to unearth lost secrets. When Coop discovers how the two crimes are linked, a grim message becomes clear. He's next.