Naval officer Mila Blackwood is determined to keep her country's most powerful secret - shrouding, the ability to traverse their planet in seconds through an alternate realm - out of enemy hands. But spies are everywhere: her submarine has been infiltrated by a Dhavnak agent, and her teenage brother has been seduced by an enemy soldier. When Blackwood's submarine is attacked by a monster, she and fellow sailor, Holland, are marked with special abilities, whose manifestations could end the war - but in whose favor? Forced to submit to military scientists in her paranoid and war-torn home, Blackwood soon learns that the only people she can trust might also be the enemy. File Under: Science Fiction [ Enemy Within | Periscope Down | Gods and Monsters | Lightning Strikes Twice ]