After They Came by Dan Harary

Jonathan Tuckerman, a Los Angeles man down on his luck and truly alone in life, reaches his 70th birthday and decides to mark the occasion by drowning himself in the Pacific Ocean. Instead, he inadvertently becomes the world’s “Wonder Man” after a pair of extra-terrestrial visitors from the Pleiades interdimensional star system suddenly appear in a giant spacecraft, pluck him from the sea and present him to the media and the world as their sole “Ambassador to Mankind.”
Jonathan’s life is instantly – and dramatically – transformed forever, as he works closely with the magnificent Tall White aliens Jorthon and Kalyssa to solve virtually each and every one of man’s long-insurmountable problems.
Jorthon and Kalyssa aren’t the only aliens on Earth, however. While Jonathan’s life has infinitely improved by the arrival of these benevolent aliens, not everything is as copasetic as it seems.

Category: Science Fiction – First Contact