a possible breakthrough
John suddenly had an idea—a possible cause for the mystery. ‘Could it be something in the house?’ he wondered aloud.
Max’s keen sense of smell had been on high alert, sniffing around different areas, especially the fireplace.
John jotted down the thought in his notebook. ‘This could be it,’ he told himself, feeling a rush of urgency.
He decided it was time to take action, convinced that this lead might finally crack the case.