Muses — Elizabeth Andre

A lesbian ghost with a broken heart. Sisters who never want her reunited with her lost love. A binding spell that must be broken.
After a Halloween party ends with an untimely death, paranormal investigators Maya and Julie are called in to check out ghostly happenings at a house built by a patent medicine magnate at the turn of the 20th century. The magnate's daughters lived in the house their whole lives and never left, even after death. Now, they're angry and taking it out on anyone who enters the house. Maya and Julie have to figure out why and reignite a love that was always meant to be.
Or the sisters' torment will never end.
Muses is the second novel in the Paranormal Grievance Committee Chronicles series, but each book can stand alone.