Mary O'Sullivan would rather throw punches than parties. But though her vigilante-league family can fly and support collapsing bridges on one shoulder, Mary’s stuck with her wits, muscles, and a desperate need to prove herself. When the league uses her celebrity secret identity to infiltrate a gala, she takes the opportunity to flaunt her skills as an operative. Mary's decision to bend protocol results in the loss of a dangerous artifact—one that could grant her the power she lacks. Sidelined by the league for going rogue, she pursues the power-granting stone without backup. But she's not the only one looking for the artifact. If she can't secure it, superpowers will be available to the highest bidder—and the league's anonymity could become a thing of the past.

Her greatest power is her identity. The world knows Mary O'Sullivan as a Page Six regular; she's an heiress, a playgirl, a philanthropist—and an orphan, after she survived the plane crash that killed her celebrity parents. The world knows her vigilante alter ego, too—they just don't know it's Mary behind the mask. There's a lot the world doesn't know. Like the fact that their vigilantes work together in a top-secret superhero league. When Mary blows off that league's protocol to rescue a fire-powered newcomer, she attracts unwanted attention from the girl's father—who's got serious gripes with the league and mysterious backers lurking in the shadows. If Mary can't discover who's funding her enemy's mad-scientist experiments, she risks outing her secret identity—and allowing a dangerous new world order to rise in its place. Alter Ego is the twisty first installment in the League of Independent Operatives sci-fi superhero series, perfect for fans of Arrow and Agents of S.H.I.E.L.D.

Mary O'Sullivan makes her own rules now. Her first self-assigned mission? Track down the league retirees who helped kill her family, and bring them to justice. But Mary's crusade thrusts her deep into the shadows of vigilantism, where good and evil blur to gray. When her enemies turn the tables and start hunting her, Mary must face the darker side of heroism—or risk becoming their next victim. With the Pearl Knife increasingly disobedient, Eloise Reyna fights to maintain control over her powers—and the fractured remains of the league. But Eloise's search leaves her struggling through the Knife's web of mysteries, and if she can't get a handle on it, the fate of the world could be at stake. As control slips through their fingers, Mary and Eloise seek allies in an increasingly dangerous power struggle that could shatter the league, and their lives, forever.

Mary O'Sullivan no longer trusts her instincts. Her secret identity is blown, the league is under official scrutiny, and LIO's retirees are now their sworn enemies—all because of her reckless decisions. When mysterious strangers steal the league's most powerful asset, Mary adds one more defeat to her roster by failing to prevent their escape. Afraid of making another devastating mistake, she refuses to join the mission to track down the thieves, instead sticking to the relative safety of HQ. If that means occasionally encountering her ex in the halls, well, she's punched Nathan Pearce before. She's not afraid to do it again. But the mission goes awry when LIO's government liaison turns against them, and only Mary and Nathan remain free. With her friends in dire need and a powerful new foe lurking just out of sight, Mary must face her own demons before she can hope to defeat her enemies—and save the people she loves.

Mary O'Sullivan's world is on the brink of collapse. The Enhanced Abilities Enforcement Association is persecuting humans with powers, forcing them to register their talents with the government. With LIO no longer sanctioned, agents swarm the streets in search of the entrance to the league's hidden HQ. When Mary helps an enhanced teenager to escape across the border, she uncovers a huge community of people trapped in hiding. With even greater threats lurking among the stars, she must usher them to safety before the EAEA finds them first…

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.