A veteran OPA tech who is interrogated by the Free Navy on Medina Station. He is questioned about the recent collusion of ships beyond the gates. While innocent of the accusations of colluding with the enemy, Vandercaust changes after being interrogated, he strictly avoids anything political, withdrawing into himself.
During the Battle for Medina Station in Babylon's Ashes, Vandercaust is the only person noted to not celebrate during the operation and is the first person to recognize that the rush of ships was diversionary. He relays this realization to Roberts.
- Vandercaust is one of four characters that receive a POV chapter in Babylon's Ashes as a tech on Medina Station.