Jemima Pitt, the daughter of Thomas Pitt, head of Britain’s Special Branch, is crossing the Atlantic for the first time. Her companion, Delphinia Cardew, is to marry in a grand Manhattan affair that will join together two fabulously wealthy families. But a shadow darkens the occasion: Missing from the festivities is Delphinia’s disgraced mother—and the groom’s charismatic brother has asked Jemima to help him find her and forestall the scandal that will surely follow if the prodigal parent turns up at the wedding. From Hell’s Kitchen to Fifth Avenue, from the Lower East Side to Central Park, Jemima trudges through snowy streets, asking questions but getting few answers—and never suspecting that she is walking into mortal danger.