Death at the Door

The odd couple of crime–solving returns in Olivia Blacke's Death at the Door, where a ghost and her living roommate find another mystery on their doorstep.
Ruby Young is slowly adjusting to her new life in Boston. A big part of that is her unexpected roommate—the ghost of the woman who lived there before. For Cordelia Graves, she may no longer be breathing, but it's still her apartment and Ruby is the somewhat unwanted houseguest. They're both happy they've managed to become friends, which is a miracle considering they struggle to communicate with each other. Cordelia even set Ruby up with her old job.
When Ruby discovers the body of a delivery guy at work, the new life she's been building hangs in the balance. The last time Cordelia dragged Ruby into a murder investigation, it was almost two ghosts living in the apartment, not one. Determined to protect Ruby, Cordelia tries to shield her from the investigation, but Ruby has other ideas. It will take both of them working together to navigate the fine line between the dead and the living to bring a killer to light.