Ari, Merlin and her Rainbow knights must pull off a heist thousands of years in the past ? to save humanity's future.

The battle against the tyrannical Mercer corporation may have been won, but the war has only just begun. Now Ari and her cursed wizard Merlin must travel back in time to the unenlightened Middle Ages and steal King Arthur's Grail ? the very definition of impossible.

But the time travellers have to tread carefully. If they come face-to-face with the original Arthurian legend, it could produce a ripple effect that changes the course of history. It's a risky game where the past can be even more dangerous than the future.

Amy Rose Capetta and Cori McCarthy met while earning MFAs in Writing for Children & Young Adults at Vermont College of Fine Arts. In 2015 they co-founded Rainbow Boxes, which crowdsourced enough money to send inclusive fiction to shelters and community libraries in every US state. Every spring they host the only LGBTQIA #ownvoices YA & children's writers retreat in the US. They live in Vermont with their young son, Maverick. They are the authors of Once and Future.