Spider World series by Colin Wilson

The Spider World series is a Science-Fiction series written by Collin Wilson, the series once only four books The Tower, The Delta The Magician and The Shadowland. The first novel The Tower got split in to three novels when published by Ace Books The Desert, The Fortress and The Tower. The Delta, The Magician and The Shadowland remain the same as when they were first published.

For full reasons I will list both series in there entirety's starting with the original four books.

The Tower (the original first book for Spider world) by Colin Wilson