Darkness brings danger to the ranch, and only one dog is brave enough to face it. Hank the Cowdog, the legendary Head of Ranch Security, is facing his most serious investigation yet. Cattle are vanishing into thin air under the cover of darkness, and all the clues point to a sneaky, dangerous midnight rustler. Hank knows that protecting the herd is his most important job, but tracking down a thief who only works in the dead of night is not going to be easy. Teaming up with his nervous buddy Drover, Hank must patrol the shadowy pastures and stay perfectly alert to catch the criminal in the act. But the Texas nights are full of spooky sounds, tricky shadows, and hilarious misunderstandings that threaten to ruin the entire mission. Can Hank outsmart the mysterious rustler before more cattle disappear? Saddle up for a suspenseful, laugh out loud adventure filled with clever clues and the greatest cowdog detective in the world.