As director of New York's first and only nurse-run inner-city clinic, Marty Lamb wages the daily fight to keep the clinic running and makes the hard medical choices--about high-risk pregnancies, drug addicts with AIDS, premature babies--that come with serving a poor community. But Marty's problems are just beginning: Someone is tampering with patients' lab tests, her best nurse has developed an addiction to painkillers, and vicious poison-pen letters--from someone who seems to know everyone's deepest, darkest secrets--has the staff walking a razor's edge.