ON A MISSION OF GREAT TRUST WHEN the "Grigsby," in broad daylight, steamed into the base port with a captured submarine and her crew, and a German commanding officer who was liable for a dastardly crime at sea, there was great rejoicing both on the other naval vessels and on shore. If the German prisoners expected a stormy reception when they were landed and placed under a guard of soldiers, they were disappointed, for nothing of the sort awaited them. The British populace, though it turned out to see the captives marched through the streets, proved to be too good sportsmen to make a violent demonstration against their now helpless enemies. Darrin had no sooner turned over the prize and made his report to the British admiral than he was ready for sea once more. "Mr. Darrin," said the admiral, heartily, "when you went out the other day you promised to show me results. I take this opportunity to assure you that you have. You yourself have made some notable captures, and have destroyed some enemies whom you could not capture. Mr. Dalzell's record has also been a splendid one. The plan by which you are catching mine-layers on or near the shoals before they start out on new mine-laying work is one that has enabled our mine-sweeping craft to accomplish more than they have hitherto been able to do. The record of mines discovered and swept out of the paths of navigation is a fine one, but you have done even better work in blocking the enemy so thoroughly in their operation of laying the mines in the first instance. Your successes are assuming extremely notable proportions. To-morrow the dirigible will be ready to start out again to aid in finding mine-cargo-carrying submarines bound for these waters." "Sir," Dave replied, "I greatly appreciate your words of praise, and I can speak in the same vein for Mr. Dalzell. Now, as he has had no share in destroying the submarines that bring over cargoes of mines I intend to detail him for that work to-morrow." "That fits in with my plans," nodded the admiral. "If you will put to sea and find the 'Reed,' and then return to this port, dropping anchor, but keeping up steam, I shall have for you, to-night or to-morrow, a special task of the greatest importance." "Very good, sir. Is that all for the present?" "Yes. Your further instructions will be given to you when the time comes." "Very good, sir. Thank you." Saluting, Darrin left the flagship, returning at once to the "Grigsby," which soon put to sea. The weather being now comparatively clear, Darrin raced away at nearly full speed. Not long afterward he overhauled and boarded the "Reed," informing Dalzell of his chance to go on the hunt for the submarine mine-carrying craft on the morrow. "I had been wondering if I was to have a little share in that sport of kings," said Dan, with one of his grins. "You prevaricator!" Darrin uttered, sternly. "When did I ever hog all of the best sport and leave you the rind?"