Undead and Unfinished (Undead #9)

There's only one thing Vampire Queen Betsy Taylor hates more than the threat of hosting a traditional Thanksgiving dinner (after all, how traditional is her family?), and that's trying to get through the Book of the Dead without going insane. Every time she's tried reading it, she just gets blindsided - until this time, when the devil strikes a bargain. She offers Betsy a chance to get through the cursed (literally!) thing cover to cover and finally discover all its mysteries. There's just one teensy little catch.

Betsy and her half sister, Laura, have to go to Hell. Just long enough for Laura to finally embrace her dark heritage (after a rebellious youth of charity work and teaching Sunday school) and make nice with her mother, aka Lucifer, by picking up such skills as slicing through time and the universe with a hellfire sword. While such things might sound fun, time travel is proving to be an alarming journey for Betsy and Laura. Not only are they interacting firsthand with their own family's past, but in doing so, they're dangerously impacting the future in ways they never anticipated.

Of course, that's what Mother wanted all along. Damn her.