fall morning in 2007, a small airplane took flight over the forested town of Graham, Washington. The pilot was a detective with the Pierce county sheriff’s department, and he was flying a somewhat unusual mission. He wasn’t looking for a lost person, or chasing a fleeing suspect. Instead, he was circling the sky above the scene of a double-murder case that had him – and his whole department – stumped. The detective had run out of ideas on the ground. So he’d decided to take flight. He always thought better in the air – and he figured he would literally get a new perspective on his evidence this way. He circled over the house where the homicides took place. And that’s when he noticed something – from the sky, it became obvious in a way that he never considered from the ground. With a rush of adrenaline, he turned his plane back toward the airfield. He had a hunch – and if he was right