Arthur Chigwell. Grieving father of a son brutally beheaded by Iraqi extremists in 2004, desperate for revenge on all those he holds responsible.Jarvis Collingwood. Ex-Army sniper, his own brother gunned down in front of him in Iraq. Cold, calculating and willing.Leon Deshpande. Specialist security adviser and investigator, used to getting his man, especially if the price is right.Naomi Lonsdale. Young and naïve, easily taken in and horribly used.The London 2012 Olympic Games closing ceremony. Dotted around the vast stadium: all of the gunman's targets, enjoying an evening of spectacular celebration, little knowing how the night – or even their lives – will end.The London Sniper is a chilling contemporary thriller exploring the ultimate revenge.