Caper

'Well, you might not think it to look at me,' Dortmunder told him, 'but I got a family crest.'
'Have you?'
'Yeah. And it’s got a motto on it.'
'I am anxious to hear this motto.'
'Quid lucrum istic mihi est.'
Mr. Hemlow squinted; the red-headed hawk in flight. 'I’m afraid my Latin is insufficient for that.'
'What’s in it for me?' Dortmunder translated.
― Donald E. Westlake