One Horseman of the Apocalypse down, three more to go.Basil and his team leave France as acclaimed heroes, but a new threat arise in the East: his homeland of Bulgaria is besieged by the mechanical armies of the Unity and their ruthless dragon general, the cruel Blackcinders! With the help of his new ally, the mysterious Kalki, Basil must journey across Europe and show the invaders mankind won't kneel before them.However, challenges are many: Basil's mother Aleksandra is alive somewhere in Bulgaria; the Maleking, now short of a Horseman of the Apocalypse, schemes to enter Earth in person; and Blackcinders might prove to be the team's deadliest foe yet...But no one said being the Apocalypse Tamer would be easy.