''Threshold'' is a 1990

science fiction Science fiction (often shortened to sci-fi or abbreviated SF) is a genre of speculative fiction that deals with imaginative and futuristic concepts. These concepts may include information technology and robotics, biological manipulations, space ...

novel by American writers Chris Morris and

Janet Morris Janet Ellen Morris (May 25, 1946 – August 10, 2024) was an American author of fiction and nonfiction, best known for her fantasy and science fiction and her authorship of a non-lethal weapons concept for the U.S. military. Background Writing ...

. It is the first book of its namesake trilogy.

Plot summary

In a futuristic world, Earth is now a preserve. A captain is transported 500 years into the future and onto Threshold, which is a space habitat. Here he meets with the daughter of a Muslim leader, one of many who are being kept from their travel to

Mecca Mecca, officially Makkah al-Mukarramah, is the capital of Mecca Province in the Hejaz region of western Saudi Arabia; it is the Holiest sites in Islam, holiest city in Islam. It is inland from Jeddah on the Red Sea, in a narrow valley above ...

References

1990 American novels 1990 science fiction novels Novels by Janet Morris {{1980s-sf-novel-stub