New York City, 1910. Invisible until she's needed, Jane Prescott has perfected the art of serving as a ladies' maid to the city's upper echelons. When she takes up a position with the Benchley family, dismissed by the city's elite as "new money", Jane realizes that while she may not have financial privilege, she has a power they do not--she understands the rules of high society. The Benchleys cause further outrage when their daughter Charlotte becomes engaged to notorious playboy Norrie, the son of the eminent Newsome family. But when Norrie is found murdered at a party, Jane discovers she is uniquely positioned--she's a woman no one sees, but who witnesses everything; who possesses no social power, but that of fierce intellect--and therefore has the tools to solve his murder.