In his brave pursuit for the truth, Rogin reveals in-depth insight from top U.S government officials who have evidence of dangerous Chinese gain of function research on coronaviruses that went above and beyond the gain-of-function research that was openly discussed with US universities and institutions. Rogin revels that Chinese researchers were taking more risks in the lab, risks that governments did not understand at the time. The Chinese scientists ultimately found a way to engineer coronavirus spike proteins to exploit the ACE2 receptor in human lung cells. (Related: China rewrites COVID history, purges 300 studies linking virus to Wuhan lab.)