The Burden of Darkness is the fourth in The Marcie Kane Thriller Collection. Although part of a series, The Burden of Darkness stands alone. Like the other books in the series, this one tackles a subject of social significance. Marcie Kane's FBI consultant husband, Nathan Harris, is battle weary and suffering from PTSD from previous cases. He eventually seeks counseling with the help of Marcie, but is it too late? He has everything to gain by trying. Owen Strand has nothing to lose. He has been fired from a job, sued by a partner and now he has been handed a death sentence by a doctor. Seeking last minute notoriety, he compiles a list of people he deems to have harmed him and travels around North America picking them off with drones one by one. One person on the list is someone close to Nathan. Nathan and Owen are on opposite sides of a bridge in the most significant battles of their lives. Only one can emerge successful, but both stand to lose far more than they may have to give.