Once she was human. Now she's something else altogether. Indigo Delta is an assassin for hire. Half human, half android, she’s an elite fighting machine. She follows orders without question, kills without emotion, and gets the job done with minimal fuss. Then she meets him: Ryker Victor. Her next target. Ryker falls for Indigo the moment he lays eyes on her. Granted, she is trying to kill him, but he’s ready for her. After all, he’s also a creation of the Institute—one they desperately want to silence. Now he has to convince Indigo that he’s telling the truth and that the Institute was founded on lies they will do anything to hide. Heart of Darkness is an action-packed sci-fi romance between a man with a mission and a woman with a secret that jeopardizes them both.