Retrorsum-Aftermath chronicles Will Patterson's life after escaping the 21st century with his wife. The couple has permanently settled in the early 1930s, decades before Will's birth. About a year into living in this era, Will begins documenting his experiences, while Antoinette helps him adjust to her world. Together, they face the challenges of living permanently in a time before his own. Along the way, Will shares his knowledge of future events spanning the 1930s, 1940s, and 1950s. The couple frequently returns to Las Vegas, a place of deep personal significance, marking both their first meeting and their hurried departure from the 21st century.