The shadow girl

"The Shadow Girl" by Ray Cummings is a science fiction tale where a group of friends find themselves entangled in a puzzling mystery when a girl seemingly from the future shows up in 1945 New York, connected to a suspicious doctor. Alan, his sister Nanette, and their friend Edward are captivated by a strange television transmission showing a tower and an intriguing girl, which leads them to discover an amnesiac girl in Central Park they believe is the same person. Their curiosity pulls them into a thrilling pursuit to uncover the secrets of time travel and the girl's real identity, all while trying to uncover the truth about the unsettling Dr. Turber, whose role becomes increasingly important as the story progresses.