‘The theory accounts for a great many things, and I think we must adopt it as a basis for investigation. Let us now see what it involves.’
‘It involves Boirac having been in London on the Sunday night or Monday after the dinner party to learn what had taken place and to write his letter, and again on the Wednesday to commit the murder and arrange about the cask.’
‘Quite. It seems to me, then, our first business is definitely to find out where Boirac was on these dates.’
‘He satisfied the police he was in Paris and Belgium.’
‘I know, but we agreed alibis could be faked. We’d better have the thing gone into again.’
‘It will mean a detective.’
‘Yes, and what about La Touche?’
‘La Touche is the best man we could have, of course, but he’s fairly expensive.’
Heppenstall shrugged his shoulders.
‘Can’t help that,’ he said. ‘We must have him.’