The Knife Erwin Wields

Inside the walls, humanity believes it knows its enemies.

Titans.

Monsters without minds.

But Levi Ackerman learns quickly that not every monster lives outside the gates.

After becoming Captain of the Special Operations Squad, Levi begins to notice something strange about Section Commander Lucy Hale - Erwin's quiet, deadly right hand. She disappears without orders, returns covered in blood that doesn't belong to Titans, and answers questions with silence.

No reports.
No explanations.
No witnesses.

When Levi accidentally crosses into one of Lucy's missions, he discovers the truth the Survey Corps keeps buried: there is another war being fought inside the walls.

Human trafficking.
Political corruption.
Monsters hiding behind human skin.

Lucy has spent years hunting them in the dark for Erwin... and she was never meant to have help.

But Levi Ackerman has never been good at ignoring problems.

Especially when the blade fighting in the shadows might be the most dangerous soldier he's ever met.

And the deeper Levi follows Lucy into that hidden war, the more he realizes something terrifying-

Some enemies are far worse than Titans.