When Vampires Drink Milk

After her adoptive mother wrings a set of promises from Lori to never put her in a nursing home and never have her committed, she careens headfirst downhill, brakes off, into the type of dementia where vampires absolutely do exist, but they drink milk instead of blood.
No problem. Lori is a nurse. Besides, Lori's deceased brother—a cagey expert in many things, including acquiring illegal substances—is there to help, having set up camp inside Lori's head. After all, a promise is a promise. Right?