The novel is a poignant exploration of time travel and human emotion, where the protagonist, a man with the extraordinary ability to project himself mentally through time, volunteers for a government experiment and finds himself in prehistoric Africa. There, he becomes deeply entwined with a group of hominids, forming profound connections that transcend the boundaries of time. As he navigates the challenges of survival and the complexities of human and hominid interaction, the narrative delves into themes of loneliness, the essence of humanity, and the enduring impact of love and family, all while questioning the immutable nature of time and our place within its tapestry.

The 9624th greatest book of all time