three friends: j, harris and george, tired of idleness and wanting to correct their ill health, decide to go on a boat trip along the thames. together they take the fox terrier montmorency. before their journey, they agree to travel without females. but almost immediately on the road they meet three women going the same way as themselves: anne, emily and patricia. first, the heroes try to keep their agreement, but then fall in love with these women and the women fall in love back with them. in the finale they are already three couples in love.