Featuring beautiful black-and-white chapter-heading illustrations by award-winning comics superstar and New York Times bestselling creator Francesco Francavilla

When a glowing green trail appears outside of the Shady Shoals Rest Home, retired superheroes Mermaid Man and Barnacle Boy ask SpongeBob and Patrick to take on the case and figure out what the trail is.

Unfortunately for the two detectives, they are led through ship graveyards, underground tunnels, and ultimately into the nest of some of the most dangerous villains Bikini Bottom has ever been faced with!