It was true. Madeleine’s income — albeit irregular — had enabled them to buy all kinds of additional items for their little house in Camden. It had also transformed her wardrobe. When she and Colbeck went out together, she always dressed well and did not look out of place on his arm. It would be a wrench to leave the house in which she was born and brought up, but she was confident that her father could cope now that he’d finally got over the death of his wife. How he would fill his day during his retirement was another matter. Madeleine did not want him spending too much time at the marital home. She and Colbeck would value their privacy.

‘There’s lots of things I can do when I leave the LNWR,’ he said, giving his imagination free rein. ‘I could take an interest in gardening, learn to paint just like you, travel the country by train, get married again, have a stall in the market, write my life story, go to church more often or decorate the house. My real ambition, of course, is to work side by side with my son-in-law.’

‘You’re too old to join the police force, Father,’ she pointed out.

‘We’d have an unofficial arrangement. Whenever he had a tricky case, he’d tell me the full details and I’d advise him what to do. I think I’d make a wonderful detective, Maddy. Why don’t you mention that to the inspector? He might be grateful for my help.’

Madeleine suppressed a grin. ‘Then again, he might not.’

‘But my instincts are sharp.’

‘Robert is well aware of your instincts, Father,’ she said, turning to offer a gentle smile. ‘If he felt he could make use of them, I’m sure that he would. You’ll just have to wait. In the meantime, I think that you should just let him get on with his job.’

Two of the policemen who’d been aware of the exact train on which the prisoner would be travelling were on duty together.