Still Waters. Memoirs of the Human Wraiths, #3

Second EditionPromise, Michigan is very much like every other small town across the state. Built on the edge of a lake, the homes sit in neat little rows in cute little neighborhoods. During the summer Promise bustles with tourists who come to spend their vacation dollars and enjoy the lake's refreshingly cold water. But Promise holds a terrible secret. In the center of the lake is an abandoned island where a curse is rumored to wait for victims, unabated and deadly.
Most think it's just a story, something used to keep kids out of trouble. Still, everyone gives it a wide berth. Everyone except Bret and Adam. They dare to venture out the night of Bret's birthday. When they declared their love and promise to get married, they believe no one else heard their whispered words - but they are wrong. Five years later Adam dies, and Bret returns to his family to heal. But someone is killing the people of Promise in random acts of violence.
Bret, with the help of FBI agent Jeff McAllister, must discover the identity of a murderer with death on his mind and revenge in his heart.