Graveyard Shift: Unearth the Mystery

Design a dark and atmospheric book cover for "Graveyard Shift." Feature Alex, who wakes up in his coffin and becomes the Grim Reaper's apprentice, standing between a shadowy cemetery filled with ghostly figures and a cheerful undertaker named Happy, who is secretly the Grim Reaper. Include a powerful soul emerging from the shadows behind Alex. Use a color scheme of black, grey, deep blue, with eerie green or white highlights.