A View Through Time — J.L. Redington

Welcome to the small but beautiful town of Granite Falls, Washington. In this third book of the Esme Chronicles, Esme finds herself in the middle of a battle between the future and the present. Three travelers from the future travel back in time to find a device that could save their world. Esme must determine what the device is, who needs the device, who is trying to steal it and who invented it in the first place. Come along as Esme and her new friend, Kenai, work with Butler to save people in the future from a slow, painful death.