This is the first mission in the Samhain 2013 event, it is an investigation mission. You receive it through a phone call. The mission that follows right after is Crossing the Black Path.
Kingsmouth is on the verge of crossing into the cold, dark months. Upon this threshold, something strange has gripped the town, some force or presence that's causing local cats to scream, rise, and claw at invisible curtains in the world.
This is the same as last year's missions, you can check the walkthrough here at unfair.co.