A shy, timid, and abused thirteen year old girl named Siena finds herself and her eleven year old sister in the Underground, the realm of monsters. Will they be the ninth humans to ever fall into the underground and the third to escape? Will they free the monsters? Or will they turn them all to dust? Find out in this exciting book! Note : This is in a different timeline, but after Frisk left the Underground in a previous timeline. Note two : This is my first book, so no hate, okay? Note three : The Main characters are my ocs. Have fun reading!!! :-P