Among the Undead (Escape to KP) by Ingrid Hicks
A mysterious virus has plagued the world infecting many with an unknown disease making the recently deceased rise again. In Toronto, a small group of survivors find themselves alone fighting the undead while protecting the younger children that were left behind. Together they struggle as they try to leave the city unharmed and find permanent shelter at Kingston Penitentiary. The leaders of the group Lauren and Tyler, both lost their families and loved ones and must now struggle to protect, survive and keep the group together on their journey thus making a strong bond between them. A bond neither of them had expected.