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The Star Crystal
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I must have borrowed his one from my grade school's library three or four times. It's a choose your own adventure. The main things I remember about it are that it takes place on the Moebius Express, an interplantary ship that's in the shape of a Moebius strip, and that the alien murder victim has a legless body that's shaped like a triangle pointing downward.
The Interplanetary Spy series picked me up once I started getting a bit bored with Choose Your Own Adventure's randomness. Maybe I was tired of the randomness or absurdity, although Internet reviews did show that CYoA had a few clunkers. But it was hard not to love IS. Wild pictures of crazy alien life forms! Each fork was a choice that resulted in death if you did something wrong! Or, if not death, an embarrassing rebuke. The writing was sharp and snappy, and it ended too soon after number 12. ...more