I followed the river as it bent inward then curved back out. Its banks were crowded with workshops, small factories, and drydocks. The oppressive scent of the city eased some against the cool river breeze. Now I came upon a promenade, a large green field dissected by walkways lined with benches. I took a seat. It was about nine in the morning, Friday. The day was clear and blue. The promenade was filled with Philadelphians of all colors and kinds. Gentlemen in boaters escorted ladies. A circle of schoolchildren sat in the grass hanging on the words of their tutor. A man rode past on a bicycle, laughing. It occurred to me that this was the freest I had ever been in my life. And I knew that I could leave right then, right there, that I could abandon the Underground, and disappear into this city, float away on the poisonous air.

Young Hiram Walker was born into bondage — and lost his mother and all memory of her when he was a child — but he is also gifted with a mysterious power. Hiram almost drowns when he crashes a carriage into a river, but is saved from the depths by a force he doesn’t understand, a blue light that lifts him up and lands him a mile away. This strange brush with death forces a new urgency on Hiram’s private rebellion. Spurred on by his improvised plantation family, Thena, his chosen mother, a woman of few words and many secrets, and Sophia, a young woman fighting her own war even as she and Hiram fall in love, he becomes determined to escape the only home he’s ever known.