This is the first book of the series Unknown Worlds. In this story, young Sarah Griffinrider is awaiting her 16th birthday when a mysterious Death wizard shows up and promises a great gift in exchange for her pet dragon. She is a little unsure about the trade, since the boy has pure black eyes that make her hair stand on end, but goes through with it anyway. A month has passed since then, and Sarah's birthday is just around the corner. This is where her story begins......
12 parts