Pegasus in Flight by Anne McCaffrey (The Talent Series #2)

Earth has reached its darkest moment. In subterranean warrens, the poor eke out precarious lives where jobs are scarce and children are sold for labor—while on the surface, a privileged few enjoy lives of luxury. As the population surges and unrest spreads, a disaster of epic proportions seems inescapable. The only hope: a platform under construction in space from which starships will be launched to colonize distant planets. But the project is critically behind schedule.

In the midst of the chaos, Rhyssa Owen and her fellow Talents—telepaths who read minds, kinetics who manipulate matter, and precogs to whom the future is an open book—struggle to survive. Then two children are discovered whose extraordinary psychic gifts have the potential to avert the looming catastrophe—or hasten its ominous arrival. . . .

Goodreads Stars: 4.16

Hardcover, 1990