Desolate angel

"After I died, I wandered my town, unseen, alone, and wondering why I'd been sentenced to linger in this world. Then Alissa, the victim in a long-ago murder case I'd worked, came to me. She led me to a body sprawled in the weeds, and the terrible truth dawned on me: I'd let Alissa's real killer escape. I'd imprisoned an innocent man--and now another young girl was dead..."--p. [4] of cover.