Someone goes to extreme lengths to return something they borrowed.

The book was tattered now - the spine cracked, and the pages dog-eared with mysterious stains pockmarking random pages. Inside the front cover the words “Property of Lillian Delavie” were written in a light pen. Lillian being my former girlfriend. I’d “borrowed” the book when we had split. Now she wanted it back. The difficulty is, she’s no longer here. Well part of her is - her ghost is in my flat, which is how I know she wants the book back. There is no delivery service to afterlife, so I’m not quite sure how to give it to her.

Prompt provided by https://www.eadeverell.com/flash-fiction-prompts/