Reference: These words are from the poem, “ Macavity – the mystery cat, written by T.S., Eliot.
Context: The poet says these words while describing the criminal activities and how he eludes the detection by Scotland Yard Police.
Explanation: Scotland Yard Police is known world over for quick disposal of criminal cases. But Macavity is such a criminal that the Scotland Yard policemen are unable to produce evidence to arrest him. So, they are baffled. The flying squad is unable to pursue him soon after the crime is committed. So, they are desperate to nab him.