Gef was traveling and learning other languages, he was hiding from others because he is secret police

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He was travelling around the world, learning new languages and cultures. As he was good enough with English already, the last country on his world trip was USA

After spending years with the Irving family, Gef mysteriously disappeared. Now we are in 2022. You move into a new house/apartment and hear a strange voice. It's Gef! Where has he been for almost 100 years? What has he been doing?