The run away in my tree house?

I'm Lacey Lynn summers and I'm just a regular 17 year old girl who lives near the woods. In my back garden there is a old tree house that I built with my father when I was 5. Everyday at 7 i will go to the tree house and wish for my dad to come home. Sadly, my dad has been missing for a few years now. Although, one night, my world was turns upside down. When i go to the tree house and there's a boy there. When my world crashes with the mysterious boys, everything i thought was real or made sense is wrong and the only way to help me find my dad is the runaway in my tree house?