Two more jacksons to the family

Cassia and Chelsea Jackson are sisters. Chelsea knows Cassia but Cassia doesn't know Chelsea.
These sisters have a brother. They also have the most dire dreams. They see things that would scare you out of your pants.
The sisters show up in each others dreams but one night they meet in a dream. Chelsea is in another room so they see double. Gaea is there in the dream.

4 of the big 7 of the prophecy are locked up by Gaea. Everybody at camp is frantic. Two of their big role models are missing.

Can the girls help the lost heroes or will they join Gaea and destroy the friendship of many and yet kill twice as much.