Devin arrives at Joyland full of youthful optimism, but the summer throws him headfirst into the harsh realities of life. He confronts death, betrayal, and the realization that the world can be a cruel and unforgiving place. Through his experiences, Devin loses his naiveté and emerges from the summer irrevocably changed.

Joyland itself, with its aging rides and faded glory, embodies the lingering presence of the past. The park is haunted not just by the ghost of a murdered girl but also by the memories of bygone days, both joyful and tragic. Devin finds himself drawn into this spectral tapestry, compelled to uncover the truth of what happened and perhaps find some measure of peace for the restless spirits.

Despite the darkness at the heart of Joyland, the novel ultimately offers a message of hope and resilience. Devin, through his connection to the park and the people he meets there, discovers inner strength and a renewed sense of purpose. He learns that even in the face of loss and fear, the human spirit can endure and find ways to heal.