Half Dead by Brandon Graham

Calvert Green literally believes he's dead-but that won't stop him from diving deep into the secrets that threaten to bury him.
The car accident took his wife and nearly killed him too, but Calvert Green's problems are just beginning. He was a respected Russian literature scholar in Chicago, but due to severe head trauma, he's now suffering from Cotard's Disease-a rare physiological condition that makes him believe he's dead. He has also lost much of his memory, including the academic knowledge that defined his life.
Calvert knows few details about the accident but believes there's more going on than he's been told, so he leaves the care facility determined to find the truth behind his "death." His search lands him in the middle of a city being terrorized by a murder spree, and young homicide detective Whistler Diaz has a prime suspect. But Whistler's cousin Moe, a crusading journalist, zeroes in on Calvert, determined to prove he's not all he seems....

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