A twelve-year-old girl searches for answers when she finds an abandoned baby in the aftermath of the San Francisco earthquake of 1906

Clara Curfman is awakened from a recurring swimming dream by her big, furry sheepdog, Humphrey. Suddenly, her bed is moving and the room is shaking from side to side and up and down. The floor starts pitching like a giant ocean wave, and her books dance right off the shelves. As her parents and their neighbors cope with the earthquake’s devastating aftereffects, Clara makes a stunning discovery: A baby has been left on the doorstep of her family’s boarding house.

Is the abandoned infant a victim of the earthquake—or something more sinister?

The only clue to her identity is a silver rattle engraved with the letter H. On a quest to find Baby H’s parents, Clara meets a boy named Edgar who has been orphaned by the earthquake. Their search takes them on a winding trail of danger that will test the true limits of Clara’s courage.