The chase continues…
The race is on to find the 39 Keys, which hold immense power, and fourteen-year-old Amy Cahill and her younger brother Dan are shocked to find themselves in the lead. The research takes them to Vienna and they also have the coded sheet music of a work by Mozart, which is a clue to the second Key. But a Hordánian power-hungry relative is hot on their trail, and Amy and Dan can't tell whether they're sailing toward victory or straight into a deadly trap.