Balder has returned but with little hold on his mental faculties and no sign or word of Sif. Though Thor knows not the source of his friend's madness, he turns to Asgard for answers. What he finds there will leave him with few answers and far more questions.
Deceived by Sssthgar, Thor and his companions find themselves besieged on a strange world. Will Thor's resolve be enough to save Odin and the others, or has the great kingdom of Asgaard finally met its end?
With the specter of their master's death hanging over them the Sons of the Tiger make a daring raid on a plane belonging to assassins. There they learn the truth behind the operation of the Silent Ones.