eleven o'clock
I did n't understand for a minute , then I whispered : `` Do -- you mean -- '' `` A wave just hit my foot , '' said Jerry in a low voice . The first thing that we did was a lot of quick figuring . We thought fearfully hard and remembered that Turkshead Rock was just coming out of water when we left Wecanicut at four o'clock , so that the tide must have been within about an hour of ebb . Therefore full flood would be at eleven o'clock . But we had n't any idea of whether it was ten or eleven or twelve , because there was no light to see Jerry 's watch by . He had just an ordinary Ingersoll , not the grand Radiolite kind that you can see in the dark and it was perfectly maddening to hear it ticking away cheerfully , and no good to us at all . Just then something cold wrapped itself around my ankle .