These two splendid novels were penned by all but forgotten sci-fi author Islwyn Williams from Porth. Both were published by Gryphon in 1952 and are very Brit-centric in outlook. Dangerous Waters features an advanced race of green aliens living under the sea in Neptunia who plan to invade Britain via Pembrokeshire. Follow up novel Newbury in Orm is a space adventure with squadron leader Newbury as its hero. Apparently these works were better received in Italy than they were in the UK. Islwyn Williams died in Bridgend in 1988.