For Meridian Wallace—and many other smart, driven women of the 1940s—being ambitious meant being an outlier. Ever since she was a young girl, Meridian had been obsessed with birds, and she was determined to get her PhD, become an ornithologist, and make her mother’s sacrifices to send her to college pay off. But she didn’t expect to fall in love with her brilliant physics professor, Alden Whetstone. When he’s recruited to Los Alamos, New Mexico, to take part in a mysterious wartime project, she reluctantly defers her own plans and joins him.