the science of civilization

Brynn has been living in an abandoned farmhouse since she ran into three boys living off of the streets like her. People like Brynn have been living in the shadows as supporters of the former dictator overrun society.
With the two groups always at war with each other a threat to both sneaks in capturing people withen its merciless claws.
As people from each side start to go missing and act strangely, Brynn and her friends get deeper entangled in the mess that society has been thrust into.
When Brynn meets Ezra who's only known to follow others in the beliefs of dictating will they put aside their differences in order to save those close to them?
Or will something else get them first?