Heart of Ezdar

Jason Hayward wakes in the middle of the night to a surreal experience that leaves him terrified and confused, then lands him in the hospital. A mysterious doctor appears at his bedside the next morning, declaring he attached a living alien organism to Jason's heart for safekeeping some years prior, and has now come to retrieve it.
Professing to come from the planet Ezdar and calling himself ‘Bob,’ the galactic visitor must remove The Key from Jason’s body before a warring alien race called ...