The Farpool: Convergence

In the early 22nd century, a new craze is sweeping the Earth. Humans in record numbers are being modified as amphibians, the better to confront the growing popularity of the Seomish (the Sea People) who emigrated to the oceans of Earth from a dying planet through the Farpool. Chase Meyer, already modified, and his new wife Angie Gilliam, recently modified, have their first child. But this idyllic state of affairs doesn’t last when the existential threat of the malevolent Coethi becomes apparent to all.
Research conducted by the Chinese indicates the Coethi visited Earth millions of years ago, as well as other sites in the solar system. A mission is sent to explore an anomaly on Europa and Chase becomes part of the crew. But the mission fails to resolve the threat there and Chase returns, only to find that Angie has died in a car accident, and his daughter is gravely injured.
When intelligence shows the Coethi may have modified early life on Earth by altering the genomes of ancient viruses, and that now all viruses today are descendants of these modified lifeforms, a more critical mission is proposed: use the Farpool to send crews back in time, to ancient Earth, Mars and Europa to stop the Coethi and to monitor the Chinese, who are attempting to cooperate with the enemy.
Chase joins the Genesis 3 team, figuring to use the Farpool to go back in time before Angie’s accident and prevent it from happening. But the greater mission is to reconnoiter Earth three hundred million years ago. However, Chase and his crew don’t reckon on what the Coethi can do. They end up stranded on this ancient Earth but the crew manages to convince the Coethi invaders to help them escape. The Genesis 3 team is soon beset with even greater problems, though, when the Chinese try to take control of the alien jumpship and, through a critical navigation error, wind up on Seome just before the star-sun of that doomed world goes supernova.
Encountering far future human time travelers also fighting the Coethi, Chase must convince his future descendants to cooperate and help the Genesis 3 team depart Seome before catastrophe occurs. They get away before the end comes, but once again, navigation errors place them in the wrong time. They land on Earth, but a thousand years in the future; now there are two suns in the sky and their ship is wrecked. Stranded in the future, they leave signs of their predicament in a cave in South Africa, signs that would be discovered a thousand years before by a curious paleontologist.
Now a harrowing rescue mission must be completed to rescue the stranded travelers from a doomed future. Will the rescuers reach Chase and Angie in their new time stream? Can humans and amphibs and Seomish cooperate long enough to survive? Will the Genesis 3 team make it back home to their own time?
Only time will tell.