Books in the The Winterkill Trilogy series

I can't bring myself to give voice to what people have been whispering for weeks - since before we arrived. The remedy no longer protects us. Emmeline has finally made it to the safety of Matisa's settlement. But trouble has followed them. The sickness that the Healing Circle has cured for so long is killing people again. And Matisa's people can't afford any weakness. The Dominion are coming and a fierce battle is on the horizon...