"Rob and Frida's Battalion Zero has vanquished Dr. Dirt, but Dirt's accomplice, Lady Craven, has risen to power to finish what Dirt started: control of every biome boundary to rule the Overworld. The balance of day and night has shifted, and the mobs keep the villagers at bay, making them work ever harder during the day to replace what monsters destroy at night. Battalion Zero has suffered some losses and must regroup and recoup their resources and power."--Amazon.com