Remember Me? (Percy Jackson-- Leo Valdez Fanfic)

Kristen Black lost her best friend right after their 14th birthday; after she walked into the woods and disappeared; after a boy she grew close to came and left. No one knows if Diana is alive or dead, not a trace of her was left.
Three years later on her 17th birthday, strange things start to happen. On a camping trip celebrated with her friend Alfire and her parents, went horrible wrong when an overnight lake nap away from camp resulted in her parents disappearance... gone...kidnapped.
When on a search for her family Kristen encountered a beast that had chased her and Alfire into a hole of darkness, and into a strange camp; where Kristen runs into the one person she never thought she would ever see again.