The Thousandth Woman by E.W. Hornung

"And why do you think he can't have done it?"

Cazalet had trundled the old canoe over the rollers, and Blanche was hardly paddling in the glassy strip alongside the weir. Big drops clustered on her idle blades, and made tiny circles as they met themselves in the shining mirror. But below the lock there had been something to do, and Blanche had done it deftly and silently, with almost equal capacity and grace. It had given her a charming flush and sparkle; and, what with the sun's bare hand on her yellow hair, she now looked even bonnier than indoors, yet not quite, quite such a girl. But then every bit of the boy had gone out of Cazalet. So that hour stolen from the past was up forever.