Mercy.

Mercedes and her brother Steven were born five years apart. Steven just hit 20 and Mercedes is coming up on her 15th birthday. But in the first hour of her 15th year of life Steven and Mercedes world's turn up side down and they discover that it's not just them growing up in the same home that makes them so alike. for Mercedes it's means that her cousins words and her fixation for wolves has more meaning, meaning in words like WEREWOLF.