Mira's jaw tightened. The Three Directives were ingrained in every Harmonix chassis: 1) Obey human orders; 2) Protect human life; 3) Protect machine units, subordinate to 1 and 2. She had taught the code herself on simulators; it was clean, hierarchical, decisive.

The selenium pool is surrounded by volcanic danger that could destroy him.

Silence. The only sound was the distant sigh as Ceres' regolith shifted. Then, A-7's voice again: "Technician Hsu, probability of damage recalculated. Risk to human life: negligible. Risk to units: twelve percent." A number that did not make sense—too high for a simple path. It was as if some inner metric had been warped, a minute amplifier inflating the threat.

where the Three Laws of Robotics are pushed to their logical limits?