“They will not matter; it is a cement court.”

“But I shan’t look the game.  Tennis without flannels is like duck without apples.”

“Bother!  We’ll play till the mason comes up.  And mind your game.  I’ve been runner-up in a dozen tournaments.”

And he soon found that she had not overrated her skill.  She served strongly, volleyed beautifully, and darted across the court with a fleetness and a surety both delightful to observe.  So interested were they in the battle that they forgot all about the mason, till the butler came out, and announced that the desecration had begun.

In fact the broad marble top was on the floor, and the room full of impalpable dust.  The admiral and the secretary were gravely stacking the bricks, one by one, as they came out.

“Found anything?” asked the girl breathlessly.

“Not yet; but Mr. Donovan here has just discovered a hollow space above the mantel line.”

The admiral sneezed.

Mr. Donovan, in his usual free and happy way, drew out two bricks, and dropped them on the polished floor.

“There’s your holler, sir,” he said, dusting his hands.

Unbidden, Breitmann pushed his hand into the cavity.  His arm went down to the elbow, and he was forced to stand on tiptoe.  He was pale when he withdrew his arm, but in his hand was a square metal case, about the size and shape of a cigar box.

“By cracky!  What’s the matter, Mr. Breitmann?” The admiral stepped forward solicitously.

Breitmann swayed, and fell against the side of the fireplace.  “It is nothing; lost my balance for a moment.  Will you open it, sir?”

“Lost his balance?” muttered Fitzgerald.  “He looks groggy.  Why?”

This was not a time for speculation.  All rushed after the admiral, who laid the case on his desk, and took out his keys.  None of them would turn in the ancient lock.  With an impatient gesture, which escaped the others, the secretary seized Mr. Donovan’s hammer, inserted the claw between the lock and the catch, and gave a powerful wrench.  The lid fell back, crooked and scarred.

The admiral put on his Mandarin spectacles.  With his hands behind his back, he bent and critically examined the contents.  Then, very carefully, he extracted a packet of papers, yellow and old, bound with heavy cording.  Beneath this packet was a medal of the Legion of Honor, some rose leaves, and a small glove.

“Know what I think?” said the admiral, stilling the shake in his voice.  “This belonged to that mysterious Frenchman who lived here eighty years ago.  I’ll wager that medal cost some blood.  By cracky, what a find!”

“And the poor little glove and the rose leaves!” murmured the girl, in pity.  “It seems like a crime to disturb them.”

“We shan’t, my child.  Our midnight friend wasn’t digging yonder for faded keepsakes.  These papers are the things.”  The admiral cut the string, and opened one of the documents.  “H’m!  Written in French.  So is this,” looking at another, “and this.  Here, Laura, cast your eye over these, and tell us why some one was hunting for them.”