The end is near! Book 9 of the #1 NY Times Bestselling series.
The shadow of a man in black has followed fourteen-year-old Amy Cahill and her younger brother, Dan, on their worldwide
search for 39 Clues that lead to a great power. Amy and Dan know the man in black has tried to kill them. They know he's
a Madrigal, the most secretive and terrifying group hunting for the Clues. Amy and Dan have run hard and fast, but they
can't escape the man following them. And now, in the wake of a terrible tragedy, he's ready to step out of the darkness
for their final confrontation.