It is completely unimportant. That is why it is so interesting.

The line plays on a paradox: precisely because something has no practical consequence—no stakes, no duty, no moral weight—it can be pursued with pure curiosity. “Unimportant” here suggests freedom from obligation and utility; “interesting” names the pleasure of attention for its own sake. Read this way, the quote defends the value of play, gossip, puzzles, or art—activities often dismissed as trivial—because their very triviality makes them safe arenas for imagination and observation. It also hints at Christie’s own craft: detective fiction turns apparently minor details into absorbing mysteries, inviting readers to take delight in what seems inconsequential until it isn’t.