In the ruins of Caswell, Maine, Carter Bennett glimpsed the truth of what had been right in front of him the entire time. And then it was ripped away from him. Desperate for answers, Carter takes to the road, leaving family and the safety of his pack behind. But therein lies the danger: wolves are pack animals, and the longer Carter is on his own, the more his mind slips toward the endless void of Omega insanity. Relentless, he pushes on, following the trail left by the feral wolf he tracks: Gavin, the son of Robert Livingstone. The half brother of Gordo Livingstone. What Carter finds will change the course of the pack forever. Gavin’s history with the Bennett family goes back further than anyone knows. And it includes a secret kept hidden by Carter’s father, Thomas Bennett. But uncovering this knowledge will come at a price: for the sins of the fathers will come to rest on the shoulders of their sons. Brothersong is the fourth and final book in the beloved Green Creek series by bestselling author TJ Klune. Start the journey with Wolfsong.