Jordan and Peter travel outside the safety of the abbey to retrieve some specimens and discover just what's living in the woods; at the same time, Sister Amy plots to make the CDC team leave forever.

Michael struggles to keep the abbey under control as the CDC team move closer toward tracking the source of the pathogen; at the same time, Alan fights the urge to rejoin his former colleagues and comes to terms with the reality about Peter's allegiances. In the future, Walker takes a risk attempting to escape her delusional father.

Peter reveals is brother's secret and gets them both in trouble; at the same time, Kyle has his hands full trying to quarantine the orchard and the infected hive.