Astro is a stellar Steller sea lion! Only a few days old when found orphaned, he is cared for and raised at The Marine Mammal Center in Sausalito, California. When big enough to be released to the wild where he needs to be, he has other plans! Just like a lost dog finding his way home, Astro keeps swimming back towards the Center, crossing miles of open ocean water to do so. After several attempts, people realize that Astro is too accustomed to humans and will just keep coming back. Based on real events, readers follow Astro through some of his travels that have now taken him across the U.S. to his current home at the Mystic Aquarium in Connecticut.