"On rotation at Pittsburgh's Angels of Mercy Medical Center and struggling to finish medical school, Amanda Mason can't afford to make any mistakes--or to reveal a troubling secret. Mysterious symptoms that defy diagnosis have been affecting her performance as she struggles to maintain control, the only person who seems to notice is the irritatingly observant--and sexy--Dr. Lucas Stone. But when two patients who experienced the same strange symptoms die, and another slips into a coma, Amanda realizes her own clock is ticking. With help from her friends, Gina, a roommate recoverikng from her own trauma; Lydia, a streetwise EF attending, and Nora, the by-the-book charge nurse, Amanda must solve this medical mystery before she becomes the next victim..."--p.[4] of cover.