The Cheyne Mystery by Freeman Wills Crofts

Inspector French had gone to bed in the tiny but comfortable stateroom which had been put at his disposal by the officers of the Admiralty boat while that redoubtable vessel was slipping easily and on an even keel through the calm waters of the Straits of Dover. He awoke next morning to find her plunging and rolling and staggering through what, in comparison with his previous experiences of the sea, appeared to be a frightful storm. To his surprise, however, he did not feel any bad effects from the motion, and presently he arose, and having with extreme care performed the ticklish operation of shaving, dressed and climbed with the aid of railings and handles to the companionway, and so to the deck.

The sight which met his eyes on emerging made him hold his breath, as he clung to the rail at the companion door. It was a wonderful morning, clear and bright and fresh and invigorating. The sun shone down from a cloudless sky on to a dark sapphire sea of incredible purity, flecked over with foaming patches of dazzling white. As far as the eye could reach in every direction out to the hard sharp line of the horizon, great waves rolled relentlessly onward, wavelets dancing and churning and foaming on their slow-moving flanks. The wind caught French and, as if it were a solid, held him pinned against the deckhouse. He stood watching the bluff bows of the boat rise in the air, then crash back into the sea, throwing out a smother of water and foam some of which would seep over the fo'c'sle, and after swirling through the forward deck hamper, disappear through the scuppers amidships.