Tim's Winter Adventure
This is a prequel that takes place before Lesson One: Vampires, and sees Tim helping his mentor, Ben, save his daughter, Nikki, after she's kidnapped by Krampus. Their quest takes them to the North Pole, where they meet Selene, the Queen of Ice and Snow, some very mean Santa's elves, and Santa himself. The book also marks Theodore Stoker's first real appearance in the series.
The e-book description states that this features implied puppy-eating, normal violence, ocular violence, violence against humans, violence against animals (but it's Rudolph, who's evil and ate a puppy, so...), and cannibalism mentions. On the one hand, it's accurate, on the other, it's probably not as noticeable while reading.
INSPIRATION
Andersen's The Snow Queen and those creepy vintage Krampus postcards.
Want to know more? Read About Tim's Winter Adventure, in which we go into more detail about creating the book.