This paper poses the question, “what are providers’ obligations to patients who lie?” This question is explored through the lens of a specific case: a 26–year–old woman who requests prophylactic bilateral mastectomy with reconstruction reports a significant and dramatic family history, but does not want to undergo genetic testing. Using a conversational–style discussion, the case is explored by a breast surgeon, genetic counselor/medical geneticist, clinical psychologist, chair of a hospital ethics committee and director of a clinical ethics consultation service.