Speedboat racing from Southampton - one of the boats capsizes.
Full title reads: "Southampton. 'Motor Boat Week'. Miss Betty Carstairs - renowned woman speedboat racer - 'takes a ducking' in thrilling race for Detroit News Trophy."
Scenes of motorboat racing in Southampton Harbour. Mr. Hubert Scott-Paine is racing in 'Miss Britain I', he is leading 'Whiteleaf III'. Shots of Miss Carstairs in her boat 'Newg I' rounds the buoy. Closer shot of 'Newg I'.
Long Shots of launches approaching the capsized boat driven by Miss Carstairs. Both she and her co-pilot are okay. The boat starts to sink. The tow boats left in the race come past. 'Whiteleaf' is winning.