The 39 Clues, one of Rick Riordan's most famous series, has continued on past the Cahills' discovery of the Master Serum. The Cahills, who have finally resolved their civil war only barely recently, are now on the precipice of of another war, this time at the hands of the Vesper Organization, seeking to destroy the Master Serum seeing it as a threat to their underground influence. While attempting to produce the Master Serum, it came to light that not only were the Cahills fighting the Vesper Six, but also the Cahills that were Vesper sleeper agents.

As the Cahills, will you harness the powers of governments and judiciaries to ensure the Master Serum is created and bring humanity into a new era of greatness? Or will you stoop to the level of the Vespers and stop at nothing to eradicate the Vesper Organization?

As the Vespers, will you fight a war of cat and mouse with the Cahills to undermine their procurement of the Master Serum, or will you declare an open war on the Cahill Family and acquire the Master Serum for your own use?

Directed By Tom Cai