Bigfoot, the Abominable Snowman, the Loch Ness Monster - cryptozoologists are trying to track these creatures down and research them. One also appears in the legends of the Ashanti people in Ghana.

These tell of human-like creatures that lurk in the trees at night and take their victims off to their caves to suck their blood: the Asanbosam. Right after journalist Sam Peters has escaped from a volcanic eruption on an Indonesian island caused by terrorists, her boss sends her to Africa. Soon enough, strange things start happening at Bosumtwi, a mysterious crater lake. Could the Asanbosam really exist? Sam Peters is searching for the answers in this thrilling tale of the Secret Files series.