Sabotage on The Moon
Many accidents happened on the Moon, wherever Esta, the Venturial girl, were around. Began with the explotion of a single electric train. Fortunately Esta could escape in time.
Zeta was very concerned that somebody wanted to kill Esta. But there was no proof. Even the police could not find any clue. It seemed that the rumour among the people on Moon that Esta carrying a bad fate was true.
Esta will be deportated in a certain short time. Zeta who was temporarily teaching a junior high school in Colony Imbrium, with Alpha, Thena, Art and Kron tried to find out why and who wanted to kill Esta. Some clues gave fact that several of Zeta's students were involved. Then Esta, Thena and Art were trapped in the school's warehouse and were almost killed because of the lackness of oxygent. 
Thena found out that Esta could read some files about precious stone's shipment from the Moon to a place on Earth. Of course Esta could do that, because her computer level was much higher than the computer system on the Moon. But maybe that was the source of her trouble. Somebody was very angry with her. She must open a secret file.
Then they were almost trapped by a self-timer fire explotion in Colony Mendeleev, in an unfinished construction area, near a pyroxene mine. Esta was safe, but Zeta's students, Xirra and Phiko, were in danger. Kron flew his spacecraft and holding on a rope Thena saved them one by one from fire.
There was one victim with broken arm and leg, which was Vano, another of Zeta's student. He was the link of the mystery. So they found out that the Moon's governor, Vano's uncle, was the man behind the sabotages that caused accidents around Esta. The man tried to escape from Moon with his spacecraft. But Zeta and his friends, flying with Kron's spacecraft, captured his spacecraft with a net and some glue shots on the spaceport.
The valuable stone was jadeite from pyroxene family and secretly was found in one of the mine on the Moon. The hidden jadeite itself, the jewel in the shadow, as it was written in the secret file, was finally  found in the deep of the tributary of Amazon. 

First version of cover.

Second version of cover, added later as jacket cover.

[published by P.T. Pustaka Utama Grafiti, Jakarta, Indonesia, in 1987] 

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