. . "978-0-451-45022-7" . . "Threshold is a 1990 novel by Chris Morris and Janet Morris. It is the first book of its namesake trilogy.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."@en . . "209"^^ . . "Threshold"@en .