‘Let’s go and have another look at those birds’-nests while we’re waiting,’ said Charlotte, with great presence of mind. And so it was through the little diamond panes of the lodge that they saw again the Murdstone gentleman, in evening dress and an overcoat, with his tie in a crumpled state under one ear, and his face, as Charlotte said, exactly like the face of a baffled executioner.

He stood talking to the Police for a few moments, with the old familiar scowl that they knew so well. They felt like that about it, though they’d only met the scowler, as you know, on one occasion. Then he went back through the gate, and the children, when they were quite sure that he was gone, rejoined the Police, rather tired, and feeling as though this silly game of looking for what they knew, or at any rate hoped, they weren’t going to find, had been going on for ever, and seemed as though it would never stop.

‘I thought it best,’ the Police explained to William, ‘to keep the gent on the outside of the place. He seems peppery-natured, and if he was to spy his boy among your glass-houses, which is where I propose to conduct my search in next, I wouldn’t answer for it but what he’d leap upon him among the glass like a fox at a duck, and damage untold, as like as not.’

Need I tell you that Rupert was not discovered among the glass?

Less brisk than at its starting, the search-party returned to the side door where the coloured glass was, to be met on its doorstep by Caroline, rather out of breath and very hot. She carried her sun-bonnet by its strings (Aunt Emmeline believed in sun-bonnets and made dozens of them, as presents for all her friends).

‘Well?’ said Caroline.

‘We haven’t found him, Miss, if that’s what you mean,’ said the Police, taking his helmet off and wiping his face. ‘I suppose you ain’t seen anything?’

Caroline looked nervously at the others.