Arty and the Hunt for Phantom - Mark L Redmond - Bog

In the second book of the series, thirteen-year-old Arty, still struggling with bitterness over the death of his father, develops into a real cowboy. His mother reluctantly allows him to get his first gun when Marshal Bodie agrees to teach him how to handle it safely. Then a cattle-killing black cougar, named Phantom, returns to the territory; and Arty faces a situation that tests him as he's never been tested before.