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side. Kevin went striding resolutely along the main track.

'Wait!' Marcus cried. 'How do you know that this is the right way? He could have gone the other way.'

'Don't be so uptight, Marcus. This is obviously the way. If Karl had turned off, he would have waited to tell us. Come on, let's get going.'

'No,' Marcus insisted tremulously, 'let's wait here and call out until he comes back for us. It could be really dangerous if we lose him. We could get lost all alone in this jungle.'

'Marcus, why don't you just turn around and go back?' Kevin asked testily.

'What do you mean?' Marcus demanded. 'Go back where?'

'You're not going to enjoy this. You're not cut out for it. Why don't you just forget it and go back to town? It's not too late. There are a lot of ranches back there on the way. You could even rent a donkey and make it back to Apolo by tomorrow.'

'Bullshit!' Marcus fumed. 'Of course I'm enjoying myself. Who are you to decide if I'm going to enjoy myself or not?'

'OK, forget it. Just forget it,' Kevin closed the subject and walked on.

We trailed behind him in silence, the mood tense. After a while we spotted Karl and Flaca; they were sitting, resting next to a little stream.

'Look what I found!' Karl called, waving to us. He was holding a large frog. I would never have