Lu has plenty of opinions when it comes to deciding on Dana's replacement, but she soon learns that Dr. Robert Jackson, the chief of staff, has already hired someone for the position. Enter Dr. Andy Campbell, a former Army colonel who has returned to civilian life for the sole purpose of co-directing the Rittenhouse Women's Health Clinic. It's not long before tempers flare and Andy and Lu butt heads over a case involving a wealthy patient who needs a kidney transplant and a poor woman who sells her healthy organ for the money.

Strange things are brewing at Rittenhouse. A patient seeks Lu's treatment for what appears to be a simple rash; but upon closer examination, the condition turns out to be a dangerous flesh-eating bacteria. Meanwhile, Andy is caught in the middle of a sensitive case when a mother wants to have her schizophrenic daughter's tubes tied. And Peter tries to piece together clues to close the book on a doc who's up to something sneaky.

A local politician hot on the campaign trail needs Andy's help to remain cool under pressure. Her issue? She wants to stop blushing. Meanwhile, Lu tries to ease her patient Melissa, a former drug addict, into taking pain medication for a muscular disorder. But after she starts the meds, Melissa is soon rushed into the ER—and Lu must help fight for her patient's life.

Trouble hits home when Andy suspects that her daughter has an eating disorder. On the job, the doctor doubts herself when confronted with the mysterious deaths of three of her patients. Meanwhile, Lu acts quickly to stop a possible outbreak of varicella, aka chicken pox.

Dr. Campbell's diagnosis of the first local case of West Nile Virus causes a near panic in the community; Lu tries to help a hard-working mother remain close to her hospital-bound son.

Dr. Campbell's husband hits her and she kicks him out of their house.

Lu meets Andy 's replacement, Dr. Dylan West, an obnoxious man she worked with when she was an intern as they struggle to save the lives of the many people involved in a train accident. Later, she discovers something shocking while talking to a bipolar patient. The president is in town and the Secret Service makes sure the hospital keeps plenty of B- blood (the president's rare blood type) on hand. Dylan tries to help a pregnant patient make the right decision about a potentially hazardous surgery. Meanwhile, Lu contemplates marrying Jonas while dealing with the obnoxious woman who caused Dr. Jackson to lose his job. Later, the unthinkable happens to Lu and she and those close to her struggle to save her life.