Mary O'Sullivan is out of her depth, and out for blood.

With her headquarters buried in rock, her resources are scarce. But Mary needs to stop the vengeful alien demi-god, Sever, before he murders the man she loves — and before his prison of a forcefield spreads around the globe.

But saving the world isn't a solo business, and Mary — along with the whole league — will need to let go of her past grudges if she wants to rescue the future.

Defender is the concluding volume in the League of Independent Operatives superhero saga.