‘It’s OK. You’ll tell me what you want when you want. Though I’d like you to know this: you can trust me. If you speak to me in confidence, it remains between you and me.’ They turned off the motorway to a sign marked ‘City Centre’. ‘But there’s one thing you do have to tell me right now. Where are we going?’

‘Straight to the hotel, please. And if it’s a dump, take me home.’ Patrick set the SatNav for the out of town ‘Savoy Inn’ into which Clovis, with a blind loyalty to the name, had booked them. It turned out to border an industrial estate filled with garages and self-storage units. Ten minutes after checking in, Patrick opened the passenger door to a Sara dressed in a long broad black skirt which gathered by her ankles, dark brown jacket and marginally lighter brown hijab replacing the usual blue scarf. He cast a fleeting look of amusement and was reprimanded by a silent raise of her eyebrows.

Even if the Asian and white population split was similar, Blackburn seemed a different world from her part of south London. Though the people were the same, here there was just a distinct lack of bustle. She imagined the place in its Victorian prime; a boom town of the industrial revolution. Then it had been the weaving capital of the world; dotted with textile mills, over a hundred and forty of them according to her recent research, driving a massive churn of activity within the green fold of the hills where they lay. Granted, there had been little joy there for the sweating workers, lungs saturated by fine clouds of cotton dust, particularly the hand weavers who would eventually be overtaken by mechanisation. But there must have been a surge of energy. Now, except for civic relics like the museum, and one half of the town hall incongruously attached to its modern glass and steel extension, the great Victorian buildings had largely gone – except for the foul-smelling brewery – and the streets appeared lifeless, tinged with sadness. Shops and pubs were boarded up. People seemed to move more slowly, with less purpose.

The demarcation between the neighbourhoods housing the South Asian Muslims, and the two-thirds of the population who were white English, was stark and discomforting. Patrick, a black Briton, was out of place. He would have to maintain a low profile.

Samir Mohammed’s home address in the twelve-year-old file was given as 59 Gent Street. Patrick dropped her at the low number end of the street and assured her that his watch would be discreet. She made her way up, knocking or ringing on numbers 9, 19, 29, 39, 49. Only one, number 29, answered. Her market research questionnaire was devised to last no more than ten minutes and she was soon sounding the bell of No. 59. A single chime responded, followed by a late middle-aged Asian woman still in the process of covering her head with a black scarf.

‘Yes?’