Wo Tin travels from Hong Kong to Thailand for business, having been invited by his brother. A young Thai woman, Lala, accompanies him and they pick up a wounded young woman before being embroiled in crocodile evil…

Yuen Jun Hap is a top class surgeon, amateur detective and martial artist with an insatiable curiosity and the moral code of the traditional youxia. His curiosity draws him into investigating a slew of seemingly unrelated kidnappings and other bizarre crimes. However, as Yuen investigates deeper he discovers all the crimes are in fact linked and are part of a plot by a doomsday cult. Convinced that mankind is due to be wiped out by an extraterrestrial source, the cult's crimes are carried out to hide and fund the theft of genetic material from the brightest and fittest human specimens in order to create a master race with which to repopulate the earth.

~~ Adapted from the novel series "Dr Yuen Series" (原振俠系列) by Ni Kuang (倪匡).