The Inn Between by Danika Brown:
 
"Till death do us part" was never meant to be the end.

Nova Taylor has never felt more at home than when she’s surrounded by ghosts. So when her only living friend is nearing the end of her life, Nova refuses to mourn. Instead, she’s determined to give her the love story she deserves.

To do that, she turns to Maverick Oakhorn, a ghostbuster with a deep skepticism about meddling with the dead.

As they work to reunite the lost loves, she finally feels like she’s building the life and the family she’s always longed for.

Until a spirit that should have been left to rest threatens to tear it all apart.

Now, to protect the people she loves—living and dead—Nova must trust that the souls that are meant to stay will and that some bonds are too strong to break, even in death.