I know Germans, and they are mad about working to a plan.
Where the devil can I get a book of Tide Tables ?' Whittaker brightened up.

'It's a chance,' he said.

'Let's go over to the Admiralty.' We got into two of the waiting motor-cars--all but Sir Walter, who went off to Scotland Yard--to 'mobilize MacGillivray', so he said.

We marched through empty corridors and big bare chambers where the charwomen were busy, till we reached a little room lined with books and maps.

A resident clerk was unearthed, who presently fetched from the library the Admiralty Tide Tables.