In "Undercover Muslim", Theo Padnos brilliantly evokes a landscape and journey that few Westerners have experienced. He investigates the radicalisation of these disaffected young men as they move, almost unnoticed, from London, Berlin or Paris to their new spiritual home in Yemen. Padnos' journey takes him from the newsroom of a Yemeni newspaper to the prayer rows and lecture rooms of Yemen's m…