How do you solve a murder where a gang is involved, where there is little or no evidence as to who inflicted the fatal blow, and where no-one is talking? The answer lies in the powerful legal doctrine known as ‘Joint Enterprise’, which allows entire groups of people to be prosecuted for murder even though they may have had no role in the actual killing. But while there may be a political value in having a mechanism to allay public fears of gang violence, it’s imperative that juries are able to reach the right verdict and not the most popular or most convenient.