Flatline — Linda Bond

People are dying in Dr. Joshua Salvador's ER. His medical assistant, only weeks from delivering her baby, hangs on to life by a thread. The symptoms seem horrifyingly familiar, and he begins to suspect the deaths are targeted at him. But, before he can figure things out, top TV investigator Rachel Wright is standing in the middle of his ER, convinced an outbreak, an epidemic, or even a botched flu vaccine could be the cause, and she's going to tell the world.

Each book in the Investigators series is STANDALONE:
* Alive at 5
* Cuba Undercover
* Flatline