Stallion Gate was Smith's second novel, following his very successful debut with Gorky Park, but having no tie-in with or references to the earlier novel.
Smith's novel is a fictional biography of U.S. Army sergeant Joe Peña, member of a Pueblo community native to the Los Alamos area around the Trinity test site. When the story begins, Peña is in solitary confinement at Leavenworth, having run afoul of an officer.
He is suddenly rescued by an Army intelligence officer and assigned to be aide and bodyguard to Joseph Oppenheimer. Agostino believes Oppenheimer is a Russian spy, and Peña must report anything he learns about the scientist - or be sent back to Leavenworth.
The novel is better at dramatic descriptions (perhaps exaggerations) of events than at scrupulous adherence to the historical record, but never strays into make-believe.
Some of Peña's character development reminded me of the protagonist in From Here to Eternity. Both novels are set in the WWII military. Like Private Lee, Sergeant Peña follows instincts that constantly get him into hot water with his superiors, while remaining popular with non-military peers. Also like Lee, Peña is a boxer and, in both novels, one source of dramatic tension is the buildup to a big boxing match. A third similarity is that both characters are musicians. Peña is a jazz pianist, and Smith demonstrates an expansive knowledge of that genre.
Some historical Persons appear as themselves in Stallion Gate, while others are replaced by similar but fictional characters. For example, in the actual events, a Polish-British physicist named Joseph Rotblat quit the Trinity team for reasons of conscience after Germany surrendered. A fictional British scientist does that same thing in the novel.
Stallion Gate is a very entertaining historical novel that doesn't mess with the history (or the science). Highly recommended. Next up is a re-read and review of the 1997 Joseph Kanon novel Los Alamos.