The kraken is the biggest monster in the sea. And in the 1950s, it seems to be headed straight for Boston! Marcus, Jorge, and Amy travel in Tío's time machine to the world of the Red Sox and Boston Harbor, racing to find the kraken and send it back to the northern seas where it belongs. Their journey takes them from Fenway Park to a high seas adventure as they learn about the culture of the 1950s, the mythology of the kraken, and even some marine biology.