Aquamarine Discreet was a Lifesider citadel, and its security was absolute. Mosaic blowups of the Jovian moon, Europa, covered the discreet’s walls: bright grooved terrain in ice-white and dusky orange, interior seas in blue and indigo. Over the burnished conference table hung a Europan orrery, where jeweled spacecraft representing Lifesider satellites ticked quietly on orbits of silver wire.