'Such as?' queried Gringall.
'Such as bluffin' him that the Riverton family were goin' to institute criminal proceedin's against him, an' if he got sufficiently scared, try to get some of The Mug's money back.'
'Nice technique,' said Gringall. 'You private detectives get around, don't you?'
'You'd be surprised,' said Callaghan. 'All right. Well, I got down there at half-past twelve. I went down to the landin' stage. There was a boat tied up there. I pulled out to the San Pedro. When I got there I found another dinghy tied up at the bottom of the accommodation ladder. I had the idea in my head afterwards that that was the dinghy that young Riverton had used to pull out to the San Pedro.
'I went aboard the boat, but I couldn't hear anything. I went downstairs an' started lookin' around.
