Summertide - Heritage Universe, Bk 1 Author:Charles Sheffield It was just before Summertide, the time when the twin planets, Opal and Quake, would orbit closest to their sun, subjecting both--but Quake in particular--to vast tidal forces. And it was to be the most violent Summertide ever, due to the Grand Conjunction of the system's stars and planets, something that happened only every 350,000 years. A... more »ccess to the unstable Quake was supposed to be prohibited, but some very insistent travelers were determined to make the trip....Planetary Administrators Hans Rebka and Max Perry had no choice but to go to Quake themselves--risking their lives to protect the others--and to learn, just maybe, the secret of Summertide....« less