The Savior He Never Knew

The story

Marcus calls himself the savior of Eden, but Serena is the architect who kept the underground city alive. After she repairs the oxygen system, he signs a separation order for Lily, steals Serena's mask, and leaves her in a radiation storm. He thinks she is just cooling off in the lower levels. Three days later, Serena is gone - and half the city's power, patents, and survival systems leave with her.