Erin prided herself on her poker face. It was something she’d had to perfect throughout her life. Early on, she learned to keep her face blank rather than roll her eyes at her mother. The skill came in handy dealing with patronizing professors, arrogant attendings, any number of people who doubted, ignored, or underestimated her. She used it when telling patients or their families bad news. But when Cassie poked her head around the corner, Erin’s face broke open into a smile. Cassie came into the room on her tiptoes, like she was sneaking, even with her heavy steps on her way up from the
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