In the bustling, stinky, and glorious underworld of the city's sewers, there's only one detective who can handle the really dirty work: Detective Poop. A man of the earth, literally. But when the entire sewer rat population vanishes without a trace, leaving behind only a mysterious, shimmering residue, Detective Poop is faced with his most perplexing case yet. With the help of a nervous, fast-talking rat named Remy, the duo must follow a trail of clues that leads them straight to the Great Septic Tank and its grumpy, germ-hating villain, Blockage. Blockage has a sinister plan to "repurpose" the rats for a cleaner, more orderly world, and he's not afraid to flush anyone who gets in his way. Can this unlikely pair save the sewer from a disastrously clean fate? Or will Detective Poop get to the bottom of this case once and for all?