The Howling Stones - Tapa blanda

Expansive and colourful (John Clute, ENCYCLOPEDIA of Science Fiction)

This is one of his very best works (STARBURST)

THE HOWLING STONES is SF action-adventure at its best. Strange stones found on a newly discovered planet prove to be far more than the healing gems the aliens use them for. In fact, they control a gateway to a vast system of intergalactic pathways built by unimaginably more powerful beings than themselves. . . something that could destroy all life in the Commonwealth universe forever! Like MIDFLINX, THE HOWLING STONES is a novel set in Commonwealth universe, in which many of Alan Dean Foster's most popular adventures have taken place.