* The Colour of His Blood (2009): A thrilling tale of a young woman's journey towards uncovering her hidden heritage and the truths that lie within the depths of her ancestry.
* The Silent Shore (2011): Harbaugh takes readers to the coast of the North Atlantic, where a lighthouse keeper's fate becomes intertwined with a mysterious stranger, leading to an exploration of longing and identity.
* The Song Beneath the Ice (2014): Love and loss converge as a violinist's life is forever altered when she encounters an enigmatic cellist, uncovering the intricate connections between sound, silence, and the mysteries of the human heart.
* The Light of Lost Things (2020): Through a mesmerizing tapestry of stories, Arlen W Harbaugh weaves a narrative of love, forgiveness, and the delicate dance between letting go and holding on.
Nonfiction:
* Writing Fiction: A Guide to the Craft (2011): Drawing from his expertise, Harbaugh offers a comprehensive and insightful guide to the art and craft of writing fiction, providing aspiring writers with a roadmap to storytelling success.
* Secrets of the Literary Agent: How to Get Your Book Published (2016): Harbaugh draws upon his experience as a literary agent to share the industry's secrets and guide writers through the intricate process of getting their work published.