From the start of the COVID-19 pandemic, the origin of the SARS-CoV-2 virus has been one of the big questions. The default assumption for many has been zoonosis: a natural spillover event where an infectious disease jumps from an animal host into the human population. But could it have escaped from one of the several virology laboratories in Wuhan? Initially cast aside as a conspiracy theory, the idea has slowly been gaining credibility. Viral is a disconcerting book that considers what we know so far. Though the smoking gun remains missing, the circumstantial evidence raises several red flags. Given the increasingly heated and polarised discussion around this topic, I started reviewing this book with some trepidation.