Into the Gauntlet

Amy and Dan Cahill have been located with the notoriously unreliable Alistair Oh, possibly forming an alliance. They appear to be tracking the life of a powerful historical warrior, potentially a Cahill, whose secrets are fiercely protected. Meanwhile, in the explosive finale of the series, 14-year-old Amy and her younger brother Dan are determined to finish the 39 Clues hunt on their own terms, amidst family betrayal and dangerous secrets that could have fatal consequences.