Odyssey Three by Arthur C. Clarke

Arthur C. Clark, creator of one of the world's best-loved science fiction tales, revisits the most famous future ever imagined in this NEW YORK TIMES bestseller, as two expeditions into space become inextricably tangled. Heywood Floyd, survivor of two previous encounters with the mysterious monloiths, must again confront Dave Bowman, HAL, and an alien race that has decided that Mankind is to play a part in the evolution of the galaxy whether it wishes to or not.
Fifty years after the alien message forbidding humans to approach the moon Europa, an expedition to Halley's Comet is forced to violate the prohibition in the name of mercy. Though lacking the lyrical prose of The Songs of Distant Earth , Clarke's latest addition to the story begun in 2001: a space odyssey will entertain fans of the "black monolith."