Colony One Mars - Gerald M Kilby

All contact is lost with the first human colony on Mars during a long and destructive sandstorm. Satellite imagery of the aftermath shows extensive damage to the facility. The fifty-four colonists who called it home are presumed dead. Three years later, a new mission sets down on the planet to investigate what remains of the derelict site. But, it's not long before they realise the colony is not as dead as everyone thought. Someone is still alive -- hiding out somewhere. Yet, before they can find the elusive colonist a fatal illness starts to affect the crew. Pressure now mounts on Biologist, Dr. Jann Malbec, to locate the source of the illness and find a way to fight it. However, as she investigates she begins to suspect a dark and deadly secret lurking within the colony. A secret that threatens not just the crew but the entire population of Earth. With limited resources and time running out, she must find some answers and find them fast. Because if she doesn't, none of them will ever see home again.