Nick Neely chronicles his 650-mile trek on foot from San Diego to San Francisco, following the route of the first overland Spanish expedition into what was soon called Alta California. Led by Gaspar de Portolá in 1769, the expedition sketched a route that would become, in part, the famous El Camino Real. It laid the foundation for the Golden State we know today, a place that remains as mythical and captivating as any in the world.

Neely grew up in California but realized how little he knew about its history. So he set off to learn it bodily, with just a backpack and a tent, trekking through stretches of California both lonely and urban. For 12 weeks, following the journal of expedition missionary Father Juan Crespí, Neely kept pace with the ghosts of the Portolá expedition - nearly 250 years later.

Weaving together natural and human history, Alta California relives his adventure, tells a story of Native cultures and the Spanish missions that soon devastated them, and explores the evolution of California and its landscape. The result is a collage of historical and contemporary California, of lyricism and pedestrian serendipity, and of the biggest issues facing California today - water, agriculture, oil and gas, immigration, and development - all of it one step at a time.