"I didn't enter the laboratory after Greg's secretary left it. I was there all along." Kirk's head came up sharply. "You what?" "I was there all the time," the girl repeated. "Since noon, to be exact. I planned it that way. I knew everybody would be out to lunch between twelve and one, so I went to the laboratory with the intention of facing Greg there on his return. When I heard him and Mrs. Cordell coming along the corridor, I sort of lost my nerve and hid in a coat closet." Martin Kirk had completely dropped his air of good-humored patience by this time, "You telling me you were hiding in there for almost five hours without them knowing it?" Naia North shrugged her shoulders. "They had no reason to look in the closet. I'll admit I hadn't intended to—to spy on Greg. But I kept waiting for him to say or do something that would prove or disprove he was in love with Juanita Cordell, and not until his secretary left and he was alone with her did I discover what was between them. I must have come out of that dark hole like a tiger, Lieutenant. They jumped apart and two people never looked guiltier. He said something particularly nasty to me and I grabbed up a short length of shiny metal from the workbench and hit him across the side of the head before he knew what was happening. He fell down and the Cordell woman opened her mouth to scream and—and I hit her too." She paused as though to permit Kirk to comment. "Go on," he said hoarsely. "There's not much left," the girl said. "I was standing there still holding that piece of metal when the door crashed open and the dead woman's husband ran in. He started to lunge across the room at me and I threw the thing I was holding at him. It struck him and he fell down. My only thought was to hide, for I realized I couldn't go out through the outer office, and the only window was barred. So I hid in that closet again. "It was only a few minutes before Paul Cordell regained consciousness. He staggered out of the room and down the hall and I could hear a lot of excited talk and Greg's secretary calling the police. Then I didn't hear anything at all for a moment, so I came out of the closet and looked down the hall. The office door was closed, but it seemed so quiet in there that I tiptoed quickly to the inner door, opened it a crack and peered through. The office was deserted; evidently Cordell and Miss Dakin had gone out to direct the police when they showed up.