Mythics: the search for Avia

Four teen best friends receive mysterious jewelry from Skylars grandmother that send them on a quest to rescue their friends from a mysterious villain and they also find something more surprising as well...Skylar's mom, who may have secrets of her own.

An excerpt:
"What's going on now?" He asked.
"I'm getting you out." Replied the voice and now he recognized it.
"And why would I trust you, Scarlett?"
"Because I have the key." Scarlett replied simply. "And also because it was my plan all along."