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When I was at school I started reading a book in class that I never finished.
I can't recall much detail, but it was around the mid 80s. The only detail I remember is that there was a group of soldiers (I think) in the jungle or similar. One was a woman with a fake pregnancy bump that was actually a two way radio. The local indigenous people believed pregnant woman where sacred, and she would keep the radio safe if caught, as she was believed to be safe.
Not much to go on, but does anyone recognise the book?

I don't know that book and a quick search didn't help, but if no one here finds the answer you could ask in this group:
/group/show/...

The "What's the name of that book?" group is fantastic. Just make sure to read the instructions & come up with a GOOD topic title to point people in the correct direction. "Woman with baby bump that is 2 way radio" might be a good one. Then put as much detail as you can in the first message.

Cheers guys. I'll try your suggestions out.