Maggie and Negan travel into a post-apocalyptic Manhattan long ago cut off from the mainland. The crumbling city is filled with the dead and denizens who have made New York City their own world full of anarchy, danger, beauty, and terror.

Gaia is dying. That, at least, is what Dr. Lionel Scott believes. A renowned expert in tropical and infectious diseases, Scott has witnessed the devastating impact of illness and turmoil at critical scale. Society as it exists is untenable, and the direct link to Earth’s death spiral; population levels are out of control and people have allowed disarray and disorder to run rampant. While most are concerned about deadly disease, Scott knows that...