To tell the truth, an idea, wild and extravagant in itself, had once or twice that morning flashed through my brain. 
That morning had proved uneventful, and I was just as stumped as ever.
mnli hypothesis: That morning had proved uneventful, and I was just as stumped as ever. premise: To tell the truth, an idea, wild and extravagant in itself, had once or twice that morning flashed through my brain. 