In a world ravaged by the war between humans and machines, A-5TA, an abandoned artificial intelligence, awakens between the ruins of the past. Without clear memories, but guided by a strange connection with a human child, he undertakes a journey through a devastated landscape, seeking answers about the fate of humanity and the origin of his own existence. As it moves forward, A-5TA faces the echoes of an old conflict, the remaining threats and the fragments of a hostile intelligence network that refuses to die. It is accompanied by Élan, a child whose role could be the key to rebuilding what remains ... or to end everything. A-5TA: What Man Left Behind is a postapocalyptic science fiction novel, loaded with atmosphere, reflection and action. The start of a trilogy that explores the limits of memory, identity and what it really means to be alive.