night and sea (PJO)

Ariadne Louhi, the daughter of Nyx. But at Camp Half-Blood, no one knows that. Not even herself, until a certain boy arrives.
Perseus Jackson, or Percy. The son of Poseidon. A forbidden child, who befriends Ariadne. And on one night, when Ariadne was offering her necklace into the offering fire, the flames turned black. There was no one there to see this except the new kid, Percy. So how will she react to this blackened fire and how will he process this information? Will either of them be able to figure out that she is the daughter of an ancient goddess, before monsters come for her?