Heinrich looked sheepish. "I could not," he said. "Kraus had become suspicious of Lena; he feared she was going to betray them and the note was a warning to her. It said that if they were caught they would see to it that she went to jail mit them. At that time you were all suspecting poor Lena, and I was afraid you would send her to jail before she had a chance to prove to you that she was loyal." "You're in love with Lena, aren't you?" asked Mr. Cook. "We are to be married," said Heinrich, proudly, his eyes shining. "Did Karl suspect that Lena was treacherous?" "I think not until he saw that note." "He was going to read it to us though." "He would not have read it," cried Heinrich hotly. "He would have made up something, not what it said at all." "Who shot Lena?" "Kraus shot her. She was going to your office to warn you that your factory was going to be blown up, and he shot her to prevent that." "Who was the man with the whiskers?" asked Bob. "His name iss Mueller. He iss the one who set off the bomb tonight." "That's what we thought," exclaimed Bob. "Well, Hugh, you hit him one good one anyway, didn't you?" "I hope so," said Hugh. "There was four of them altogether," said Heinrich. "Kraus, Mueller, Hoffmann, and a man named Schaefer who went to blow up the railroad bridge Friday night and has not been heard of since." "We know where he is, don't we, Hugh?" laughed Bob. "Where iss he?" demanded Heinrich. "In jail, I guess," said Bob. "We caught him on the bridge with a bomb." "Good boys," said Heinrich warmly. "Why were you so angry when you had to go with father tonight?" asked Bob. "Where was your engagement?" "I was going with Lena to twelve eighty-two Elm Street, where Schaefer lived. You see Lena was already a member of the gang, so they thought, and I was to join too, so we both could watch them better." "Somebody telephoned Lena about meeting them there this evening." "Yes, it was Mueller. He thought he had a recruit in me." "Well, Heinrich," said Mr. Cook, "I guess that explains pretty nearly everything, and I'm sorry I ever suspected you." He shook hands warmly. "Oh, that's all right," smiled Heinrich. "I had to get suspected with the job I had. That was part of the game." At that moment the door bell rang and Dr. Clarke was ushered in. "I thought you might be interested in the hospital patients," he said. "Mr. Wernberg will recover all right, and Lena is not badly hurt. She keeps calling all the time for somebody named Heinrich. Do you know him?" "Will you excuse me, Mr. Cook?" exclaimed Heinrich, and, without waiting for a reply, he dashed out of the room, nearly falling over two chairs in his haste to get away to the hospital. "He seems to be in a hurry, doesn't he?" laughed the doctor. "I must be going, too," said Sergeant Riley. "I have some boarders down at my hotel who may need attention."