Aberdeen

The third book in the Grays Harbor Series by James Bierce.
Deceived by its desolate appearance when they first arrived, the Lockwood family finds itself trapped in the dangerous clutches of Grayland, while the others in the group make their way into the burned-out ruins of Aberdeen in search of another survivor - but with an old adversary following their every move, and the infected becoming more disturbed with each passing day, the entire group finally reaches its breaking point as the world around them begins to collapse.
Aberdeen is a thrilling post-apocalyptic horror novel that takes place in the coastal region of the Pacific Northwest, and concludes the first three chapters of the ongoing Grays Harbor Series.