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.