Sirens & Sage — A.L. Tyler

This omnibus edition of the Hawthorn Witches series includes the last 3 novellas in the series:

Ghosts & Gardenia, Hawthorn Witches Novella #7
Sirens & Sage, Hawthorn Witches Novella #8
Goddesses & Ginkgo, Hawthorn Witches Novella #9

Annie Hawthorn has survived angry werewolves, a zombie attack, and a vampire siege. But can she survive losing her sister?

It was supposed to be a simple task: erase Lyssa's memory to save her life. But the thing is, no one told her the spell would be permanent. Now Lyssa isn't Lyssa anymore, and Annie really needs a sister to talk to since her ex has started haunting her. Literally.

Tristan is dead. Somehow, he's back. He wants revenge.

But in the end, there's another family secret that Annie will find even more haunting...