Chasing his dream of a glittering architectural career, Merlin Richards has left the Welsh valleys for the Arizona desert, propelled by a handwritten note from the legendary Frank Lloyd Wright. Richards arrives at the Arizona Biltmore hotel, where he meets a beautiful young designer named Rosa Lustig. Like every man in her circle, Merlin is captivated by Rosa but soon finds himself the prime suspect in her murder.

Jealous suitors, envious workers, and the cynical police are all convinced that Richards is the killer. As he begins to put the pieces of the puzzle together, what he builds is not the impressive edifice he came to learn about, but a defence that will imprison a murderer.