▁man ages ▁to ▁dedu ce ▁the ▁location ▁of ▁the ▁missing ▁pla que , ▁leading ▁to ▁a ▁race ▁against ▁the ▁Free ▁Spirit ' s ▁oper atives . ▁ ▁Volume ▁ 4 ▁- ▁The ▁Med usa ▁Enc ounter ▁( first ▁published ▁in ▁ 1 9 9 0 , ▁based ▁on ▁the ▁ 1 9 7 2 ▁short ▁story ▁" A ▁Me eting ▁with ▁Med usa ") ▁Rec over ing ▁from ▁her ▁mission ▁on ▁Mars , ▁Spart a ▁finds ▁herself ▁the ▁guest ▁of ▁the ▁Space ▁Board . ▁But ▁relax ation ▁is ▁short - l ived ▁as ▁she ▁sets ▁out ▁on ▁an ▁inter plan et ary ▁investigation ▁— ▁of ▁the ▁Space ▁Board ▁itself ! ▁M embers ▁of ▁the ▁Free ▁Spirit , ▁a ▁religious ▁cult ▁int ending ▁to ▁gain ▁control ▁of ▁all ▁the ▁world s ▁of ▁our ▁galax y , ▁have ▁in fil tr ated ▁the ▁Space ▁Board . ▁As ▁the ▁date ▁of ▁the ▁man ned ▁mission ▁into ▁the ▁clouds ▁of ▁Jup iter ▁approaches , ▁Spart a ' s ▁susp ic ions ▁grow . ▁She ▁is ▁certain ▁the ▁mission ▁has ▁fallen ▁into ▁the ▁hands ▁of ▁the ▁cult , ▁and ▁she ▁is ▁determined ▁to ▁stop ▁it . ▁ ▁Volume ▁▁ 5 ▁- ▁The ▁Diam ond ▁Moon ▁( first ▁published ▁in ▁ 1 9 9 0 , ▁based ▁on ▁the ▁ 1 9 5 3 ▁short ▁story ▁" J up iter ▁Five ") ▁Much ▁excitement ▁has ▁ar isen ▁throughout ▁the ▁galax y ▁over ▁the ▁expl oration ▁mission ▁to ▁Jup iter ' s ▁moon , ▁Am al the a . ▁Led