 Based on Ian McEwan s short story, Solid Geometry is about Phil (McGregor) whose life is changed when he recieves 41 volumes of his great grandfather s diaries. The diaries becomes an obsession and alienates himself away from his wife Maisie (Millar). In the diaries, Phil comes across "the plane without a surface," a geometrical figure that operates as a one-way ticket to another dimension. He creates the figure and tests it on Maisie.