Sorry, the book that you are looking for is not available right now.
We did a search for other books with a similar title, and found some results for you that may be helpful.
When three alien ships appear in orbit around the Ball, which was left in too close proximity to the Threshold Terminal, the best minds among the United Nations of Earth must decide whether to protect their people or start a war. Reprint.
Series: Threshold Ser.
Number Of Pages: 272
Published: June 1993
Country of Publication: US
Dimensions (cm): 17.5 x 10.6 x 1.91
Weight (kg): 0.11