Well known for his historical crime series "Wyndham and Banerjee" Abir Mukherjees latest novel, Hunted, is a stand alone, fast moving contemporary thriller. Its a week before the presidential elections when a bomb goes off in an LA shopping mall In London, armed police storm Heathrow Airport and arrest Sajid Khan. His daughter Aliyah entered the USA with the suicide bomber, and now shes missing, potentially plotting another attack. In conversation with Ruth Dugdall