Cobalt is a created human, vat grown and born adult, with no human rights and indentured to serve others for the duration of his life. Liyan is a young man with wanderlust in his eyes, embarking on a career that takes him to the furthest regions of space. The two become unlikely friends and create a memorable long-distance correspondence. Through Liyan, Cobalt gets to explore the universe, living vicariously through his friend's wave transmissions. A strong bond develops between them that not even the stars can put asunder.