When a mind-altering toxin turns you against your own family, the line between hero and villain blurs. As Nightwing, you've faced countless dangers, but nothing prepares you for the horror of watching yourself become a threat to the people you love most. Trapped in your own body as violent compulsions take hold, can you fight against the poison eating away at your mind? The Batfamily's bonds will be tested like never before in this harrowing struggle between darkness and brotherhood.