Ghost of Honor by Pandora Pine

When an invitation to a murder mystery weekend at the Wilder Mansion is delivered, Detective Jude Byrne is all in for a few days of rest and relaxation, even though the house is rumored to be haunted by Aramis Wilder, who was viciously murdered nearly forty years ago. Jude figures with his detective training he’ll be able to solve the fictional crimes in no time.
Psychic Copeland Forbes knows better than to take things at face value. The party is being hosted by Minerva Wilder, older sister of the murdered Aramis, who does not believe the man convicted in her sister’s death is guilty. Cope thinks the invitation is a thinly disguised ruse to get a detective and medium to help solve the decades-old murder once and for all.
When one of the invitees is none other than Aramis’s convicted killer, newly released from prison, Jude wonders if he’s back to take revenge on the people who sent him to jail or to prove he was innocent all along. After a prominent guest is brutally murdered, Jude and Cope realize there is a killer with unfinished business among them.

Only one person has all the answers, the ghost of honor, Aramis Wilder. Will she reveal the name of her killer, or will Jude and Cope be next?