If the culprit is always the person you least expect, then the person you least expect should be the person you most suspect. This also means the person you most expect to be the culprit should be the last person you suspect.
READING 'I AM NOT AN AGENT'
PONDER AGENTS MERELY STATING THEIR
AGENCY ACCOMPLISH PRACTICALLY NOTHING; SO THE AGENT COULD BE
MISLEADING & THEY IN FACT ARE AN AGENT AND THERE WOULD BE NO DIFFERENCE