How does the 39 clues into the gauntlet end?

Answer 1

the family branches unite except for isabel kabra and cora wizard

and everyone that made it out of the gauntlet get two million dollars each

Answer 2

In the last book of "The 39 Clues" series, titled "Into The Gauntlet," the protagonists face their final challenge to stop the villainous Vespers from gaining power. They must work together to solve puzzles and uncover secrets in order to prevent a disaster. Ultimately, the Cahill siblings triumph in their mission, securing the safety of the Cahill family and the world.