Sewers

Harry is both shocked and horrified by the disappearance of his little cousin, Stephanie, the fourth child to go missing from his neighborhood area. He sets out to find her and enters a drain, greeted by a homeless and nameless girl living in the sewer system, fighting "the monster". Harry is taken to seek out this monster with the girl and destroy it, as it has been terrorizing the girl for years. But Harry isn't sure what to think... Could this monster have taken Stephy? Where has the girl's family gone? Is Harry suspicious of the wrong thing?
And what secret has been hidden in the sewer for countless decades?