Shortly after 5:15 p.m. on Nov. 10, a jogger turned into Granville Road in Weybridge, southern England, running along the hedge-lined street of one of Britain's wealthiest enclaves. Then, 50 meters from his home, he staggered into the road and died.
In the days that followed, Surrey police believed they were dealing with a natural, if unusual, death. Four months on, the passing of 44-year-old Alexander Perepilichnyy still remains a mystery. Two post-mortems have proved inconclusive, but the outcome of what Surrey police promise is their "full range" of toxicology tests is imminent.
To piece together Perepilichnyy's final years is to drill down into the core of Russian criminality, according to one account.