Down The Manhole {TMNT fanfic}

Ophelia Caverly is just an average New York girl. She knows the city like the back of her hand. But when she finds a katana in an alley, and swears she saw four creatures jumping across rooftops, she realizes there may be some things she doesn't know about The Big Apple. She meets the mysterious creatures she saw and discovers a whole new world just below the one she knows so well. In no time at all, Ophelia's life goes down the sewers...literally. {This is a TMNT fanfic..might be a romance story, not sure yet}