The Talisman by Stephen King

A young boy named Jack Sawyer embarks on a perilous quest across America and a parallel universe known as "the Territories" to find a mystical talisman that can save his dying mother. Along the way, he encounters a series of challenges and dangerous adversaries, including werewolves and dark forces, while discovering his own latent powers and the deep connection between the two worlds. As Jack navigates this treacherous journey, he learns about courage, sacrifice, and the enduring bond between mother and son.