Kids have imaginary friends. Rachel knows this. So when her young son, Billy, miraculously recovers from a mysterious flu that has proven fatal for many, she thinks nothing of Delfy, his new invisible friend. After all, her family is healthy and that’s all that matters. But soon Delfy is telling Billy what to do, and the boy is acting up and lashing out in ways he never has before. And Billy isn’t the only kid suddenly hearing voices.... Rachel can’t shake the feeling that this is all tied up with the flu, and something—or someone—far more sinister is at play. As rising tensions threaten to tear her family apart, she clings to one purpose: to protect her children at any cost—even from themselves. is a gripping near-future horror novel that tests the fragility of family and the terrifying gray area between fear and love.