Great audiobook "Bullet With His Name - Fritz Leiber" online free

In Bullet with His Name, two alien beings have come to give gifts to an Earthman. But this is not altruism; it is, rather, a test. The fate of his race hangs on his reactions to [the gifts]. And one of the aliens mentions that he himself is a sort of snake. The gifts do not include an apple from the Tree of Knowledge, but they might be just as likely to lead mankind astray. - Summary by Paul Hampton