Fullness of Time — Kate Wilhelm

Hiram Granville, a modern Leonardo, secured more than a thousand patents during his lifetime. His son John, an economics genius, never lost a cent in the stock market or any other financial deal. Now Cat, a documentarian, her researcher Mercy, and Cracker Jack, an electronics whiz, are preparing to do a documentary about the Granville clan. What they find as they research the family is madness, suicides, a seclusion that appears to be total, and a frightening glimpse about what it means to peer into the future.