Understanding how Covid-19 started is more important than we know for the future of humankind. Determining whether the virus came from nature or from a lab will help us to safeguard against the next pandemic.This disease will forever punctuate modern history. It has led to the deaths of millions, sickened hundreds of millions and affected the lives of almost every person on the planet. We now know that Covid is here to stay.Genetic engineering expert Dr Alina Chan and renowned science writer Matt Ridley examine the origins of SARS-CoV-2, the virus responsible for Covid-19, using their formidable skills to scrutinise arguments and rigorously analyse the sprawling data. Viral is a fascinating account that takes in pangolins, horseshoe bats, internet sleuths and misleading scientific papers. It details the evidence and investigates hypotheses for the virus origin, chief among them a potential laboratory leak or a natural spillover.Science has made great strides over the last decades. Chan and Ridley give an insight into the proliferating pathogen research and virus hunting around the world. Whatever the source of the virus, the world needs to adopt new policies and strategies to prevent or mitigate future outbreaks.Set in the caves and mineshafts, food markets and wildlife smugglers stores, laboratories and databases of China and elsewhere, Viral is a page-turner that reads like a detective novel and goes deeper into the deepest mystery of the day than any other work.This is the book on the search for the origin of Covid-19.ReviewThe result is a viral whodunnit that is sure to appeal to armchair detectives Mark Honigsbaum, the ObserverThe book collates a series of circumstantial but damning points in favour of the lab-leak hypothesis. It opens with a cloak-and-dagger scene of a BBC reporter trying to reach a mine in Mojiang, a rural area in southwest China The book has dozens of tantalising facts The book, fairly, does not conclude that the lab leak hypothesis is definitely true, merely that it is highly possible, and I agree I hope the questions that Chan and Ridley raise are answered more fully, one way or another Tom Chivers, The Times Praise for Dr Alina Chan:Both journalists and armchair detectives interested in the mystery of the coronavirus were discovering Chan as a kind of Holmes to our Watson. She crunched information at twice our speed, zeroing in on small details wed overlooked, and became a go-to for anyone looking for spin-free explications of the latest science on Covid-19 Rowan Jacobsen, Boston MagazineHere was an actual scientist at Americas biggest gene centre who was explaining why the official story might be wrong Antonio Regalado, MIT Technology ReviewPraise for Matt Ridley:What a superb writer he is, and he seems to get better and better' Richard Dawkins[Genome is] a dazzling work of popular science, offering clarity and inspiration Guardian[How Innovation Works] ranges from the truly profound to the merely fascinating Steven PinkerAbout the AuthorDr Alina Chan is a postdoctoral researcher with a background in medical genetics, synthetic biology and vector engineering. At the Broad Institute of MIT and Harvard, Chan is currently creating next generation vectors for human gene therapy. During the Covid-19 pandemic, Chan began to investigate problems relevant to finding the origins of the SARS-CoV-2 virus.Matt Ridley is a bestselling author. His books include Genome, The Rational Optimist and How Innovation Works, among others and collectively they have sold over a million copies, been translated into 31 languages and won several awards.