We fall in a lake and get lost

Gracie and Lyra are two new campers at Camp Half-Blood. They still haven't been claimed. On Halloween night, Gracie sleep-walks into the lake and Lyra follows, trying to save her. They get transported to another location and meet an old foe of Percy's.

I'm joining the writing competition of Sparkle by @-svnny_skiies-!
The prompt I'm using will be in the first chapter!

I might write a story linked to this short story!

All song lyrics are credited to the amazing Jorge Rivera-Herrans of Epic: the Musical!