The Dweller in Big Misty: Plus Sleepwalker

Two stories: The title story plus "Sleepwalker." Pete was part Seminole, but his parents moved to Baltimore when he was a small child. As a teen, he visits his cousin in Florida, and it is a big adventure for him when the two boys go on a camping trip in Big Misty Swamp.
They hear a call for help and Pete's cousin, who knows the swamp, leaves their camp in answer to the call. But he doesn't return, and Pete sets out to find him and gets lost.
He meets the ghost of a Seminole ancestor named Redhawk, who warns him that all his descendants, including Pete, are under the curse of an old enemy.
The enemy, a shaman, still lurks in the swamp in the form of a werebeast, vowing to kill all descendants of Redhawk who enter the swamp.
Pete is stalked by the creature, and then meets it face to face.
In the 2nd story, Sleepwalker: A young woman awakens in the dead of night in a cemetery. She has flashes of memory of a tall man in a black suit that terrifies her. She goes to a nearby house to seek help...and sees the tall man in the black suit.