Simple, rhyming text follows two boys and their father as they spend a rainy day riding the various lines of the New York City subway system.

"Richard Mayhew is a young London businessman with a good heart whose life is changed forever when he stops to help a bleeding girl--an act of kindness that plunges him into a world he never dreamed existed. Slipping through the cracks of reality, Richard lands in Neverwhere--a London of shadows and darkness, monsters and saints, murderers and angels that exists entirely in a subterranean labyrinth. Neverwhere is home to Door, the mysterious girl...