The group is divided when Kenzie, Saxon and Sadie fall into a tunnel. It's soon revealed to be a Weasel air vent with no easy way out. Above ground Celanawe and Leiam push on home in the hopes of returning with the supplies in time to save both Rand and Lockhaven itself. Working their way through the abandoned Weasel city of Darkheather the trio of guard mice wonder if it's as deserted as it looks. While back home in Lockhaven a poisoner is afoot!