This is a short story in the Expanse series, it provides a backstory for Colonel Fred Johnson.
The story starts with a short description of the infamous slaughter involving OPA civilians at Anderson Station that he is responsible for. Then it jumps to an unidentified asteroid in the belt. He is in a bar, depressed and putting himself at risk. Then he is picked up by some members of the OPA, interrogated for details of the attack and his responsibility and decisions leading to civilian deaths.
The interrogation is the main focus of the story. It is here that we learn about Fred’s principals and motivation. He left the service, passing up a hero’s welcome and promotion based on his own perspective on the battle. The OPA members’ goals were to see if he could be recruited for the OPA. The story ends after the OPA accepts his character and extends an offer.