When enigmatic freshman Amanda Valentino arrived at Endeavor High, she chose three people - Callie, Hal, and Nia - to guide her through the choppy waters of her new school. Except she didn't tell them about each other. When Amanda leaves, the three must reluctantly work together to figure out why. But once they start piecing together the cryptic clues that Amanda herself is leaving for them, they realize that everything they thought they knew about her is false. The more they dig, the mystery of where - and who - Amanda is deepens.

Something has infiltrated the quiet airs of Marin's Dale. Something that has never been seen. Something that mere human minds could never fathom...