‘Yes, sir. It was a quarter to eleven, and I had just put out the light.’

Tanner was nothing if not thorough. He went to the police station, learnt that Mr Brocklehurst was a solicitor with an office in the main street, and promptly called on him. In five minutes he had his information. Mr Brocklehurst had reached the pavilion about quarter before nine, for he recollected that as he had arrived at his house the town clock had struck nine.

The inspector then turned his steps to Elm Cottage, the residence of the Drews. Apart from the question of the alibi, he was anxious to meet Miss Drew and form his own conclusions as to the part she would be likely to play in the matter.

Elm Cottage was a small detached villa, set some twenty yards back from the road, and surrounded by a tiny, but well-kept garden. Tanner sent in his card, and was taken to a low and rather dark drawing-room at the back of the house, from which however there was a fine view of the river. Everything bore traces of culture and taste, but of rather straitened means. The room wanted papering, the carpet was worn, the furniture shabby. But what there was of it was good, there was everywhere neatness and spotless cleanliness, and the otherwise somewhat drab effect was met by means of flowers in bowls and vases. If the room bore the impress of Miss Drew’s character, as Tanner suspected, it showed her a fine girl, bravely determined to make the best of things which she could not remedy.

In a few moments she joined him, and as the Inspector looked at her face, he felt the character he had imagined of her was there. A low, broad forehead crowned by masses of dark hair surmounted two dark, intelligent eyes, which met his own with steady directness. Her nose was small, her lips rather full but delicately modelled, and her chin firm and well-rounded. Indeed, if anything, the lower part of her face might be considered a trifle too much developed for perfect symmetry. It gave her almost too pronounced an appearance of strength and determination, and Tanner felt she would be a person to be reckoned with. But as they talked he became convinced her power would never be used except to further what she believed to be just and right.

‘I have to apologise, madame, for this intrusion,’ he said courteously, ‘but I have been sent down by Scotland Yard to inquire into the circumstances attending the death of Sir William Ponson. Mr Austin Ponson has told me of the hoax which was played on him on the same evening, and we discussed whether there might not possibly be some connection. He mentioned your name, and I ventured to call to ask you if you would please tell me what you know about it.’

‘Did Mr Ponson tell you we are engaged?’

‘He did, Miss Drew, under promise of secrecy. He gave that as his excuse for mentioning your name, also saying he had your authority to do so.’

‘And what precisely do you want me to tell you?’

‘Anything you can about it, please. What, for example, was the first you heard of it?’