Cops & Robbers
Accompanying Martha to the bank, where she pigheadedly refuses his financial help, Castle's speculations over the phone with Becket that surgical mask-equipped customers may be robbers proves correct when everyone is held at gun-point. The call makes Becket the inexperienced hostage negotiator. Castle works out and manages to communicate both crucial and puzzling information. The hostage-chapter ends spectacularly abruptly, only to launch a very different hunt for the brain, who wasn't after cash at all.
