Seeking peace and quiet to write a novel, thirty-four-year-old Al Fieldston takes a three-month leave from his Chicago advertising agency and retreats to the Sunland Health Colony with his friend Jack Meehan. Although he initially struggles with the culture of public nudity, Al soon finds himself immersed in the complicated private lives of the camp's residents. He is pursued by Bonnie, an insatiable woman whose demanding nature tests his patience, and he unexpectedly becomes involved with Harriet, a young waitress with a distinct penchant for masochism. Complications multiply when Sandra, the director's sixteen-year-old daughter, draws Al into a clandestine affair that threatens his standing in the community.
Life at the colony is further disrupted by darker currents, notably through the predatory actions of Nick Riccio, a volatile kitchen worker whose violence shatters the colony's peaceful illusion. When Riccio attacks a newcomer named Naomi, Al is forced to intervene, leading to a brutal physical confrontation that shatters the idyllic tranquility of the resort. Throughout these turbulent weeks, Al remains captivated by Joanie Baker, a striking athletic instructor who guards a deep emotional reserve stemming from past tragedies.
Despite the distractions, Al manages to complete the outline and opening chapters of his book, realizing that the colony is far from the simple utopian escape he had anticipated. Instead, it is a place where hidden neuroses and suppressed desires are brought sharply into the open. The narrative traces Al's gradual shift from detachment to emotional involvement, culminating in a profound personal transformation.
The climax brings the underlying tensions to a head as the community deals with the aftermath of Riccio's expulsion and the local police intervention. In the quiet aftermath, Al's persistent patience finally breaks through Joanie's emotional armor, leading to a genuine mutual reconciliation. As the summer progresses toward its conclusion, both Al and Jack find their lives permanently altered by their time among the nudists, having discovered deeper truths about themselves and human relationships.