When Callum Silver arrives in Greenland for his third summer at Camp Wanagi, the only thing he feels is dread. Last August, camp took a terrible turn. Since then, things have only gotten worse. Mim is still in a coma. Meander is practically non-existent. And Cal's not the only camper suffering from bouts of insomnia and night terrors. Because this isn't just another summer with the Oracle. This year, the members of the Shade sector are turning sixteen-the age when the full aspects of their abilities finally come to fruition. Cal is terrified of seeing his first post-birthday spirit. But as the bright Greenland summer wears on, he discovers there are things more disturbing than sickness-inducing ghosts. New revelations, changing talents, and daring missions twist Cal's understanding of the past and alter his expectations for the future. When he thinks he's finally got a handle on what it means to be a Sender, the summer's final encounters prove more deadly than anyone expects. Cal's not sure how camp is going to end. But whatever happens, one thing is clear-this is a summer no one in the Oracle is going to forget. Happy birthday, Shade...