Mason said thoughtfully, "I keep thinking that Seaton girl holds the key to this thing. We'll drop in on her, ask a few more questions, and then go see His Nibs, the Stuttering Bishop. And by that time I think we'll have an earful."

Paul Drake said, "Of course, Perry, it's none of my business but why go to all this trouble over a case which probably isn't going to amount to anything, which hasn't paid you any fee and where no one seems to be in particularly urgent need of your services?"

He shrugged and said, "I'm afraid, Paul, you overlook the potential possibilities of the situation. In the first place, it's a mystery, and you know how I feel about mysteries. In the second place, unless all signs fail, what we're having so far is what is technically known as the 'build-up.'"

"Build-up to what?" Drake asked in his slow drawl.

Mason looked at his wristwatch and said, "My guess is the within twelve hours I'll receive a call from a woman who gives her name either as Julia Branner or Mrs. Oscar Brownley."

The detective said, "You may, at that, Perry. And she may be phoney. If she isn't-well, you might have lots of action."

Mason put on his hat and said, "Come on. Let's go."

They went in Drake's car to the apartment house on West Adams. Behind the windshield of a battered car, a little spot of light marked the glowing end of a cigarette. A figure detached itself from the black shadows and proved to be that of Charlie Downes. "All clear?" Drake asked.

"Everything's under control," the man grinned. "How long do I stay here?"

"You'll be relieved at midnight," Drake said. "Until then, stick on the job. We're going up. She may go out as soon as we leave. If she does, we want to know where she goes."

They took the elevator to the third floor. Drake led the way to Apartment 328 and tapped gently on the panels. There was no answer. He knocked more loudly.

Mason whispered, "Wait a minute, Paul. I've got an idea." He said to Della Street, "Call out, 'Open the door, Janice, this is I.'"

Della Street nodded, placed her mouth close to the door and said, "Open up, Janice. It's I."

Again there was no sound of motion. Mason dropped to his knees, took a long envelope from his pocket, inserted it under the door, moved it back and forth and said, "There's no light in there, Paul."

"The devil!" Paul Drake said.

They stood in a silent, compact group for a moment. Then Drake said, "I'm going down and make certain the back end of the place is covered, and has been covered ever since we left."

"We'll wait here," Mason told him. Drake didn't wait to use the elevator, but ran down the stairs.

"Suppose," Della Street ventured. "that she really couldn't have left the building."

"Well?" Mason asked.

"Then she's in there."

"What do you mean?"

"Perhaps she's… you know."

"You mean committed suicide?"

"Yes."

Mason said, "She didn't look like that kind to me, Della. She looked like a fighter. But of course there's some chance she's wise enough to have gone into some friend's apartment here in the same building. That's one thing we may have to figure on. Or, she may be inside, playing possum."

They stood in uncomfortable silence, waiting.

Drake came back, panting from his exertion in taking the stairs two at a time, and said, "She's sewed up in the place. It's a cinch she hasn't left by either the front or the rear. She's bound to be inside. You know, Perry, there's just a chance…"

His voice trailed away into silence and Perry said, "Yes, Della was wondering about that. But, somehow, I can't figure her for that sort of a play."

Drake grinned and said, "I know a way we can find out."

"Speaking as a lawyer," Mason observed, "I'd say such a method would be highly illegal."

Drake produced a folding leather tool kit from his pocket and took out some skeleton keys.

"Which'll it be," he asked, "conscience or curiosity?"

Mason said, "Curiosity."

Drake fitted a key in the lock and Mason said to Della. "You'd better keep out of this, Della. Stand in the corridor and don't come in. Then you won't be guilty of anything in case there's a squawk."

Drake clicked back the lock and said, "If you see anybody coming, Della, start knocking on the door. We'll lock it from the inside. When we hear you knock that'll be our signal to keep quiet."

"Suppose it should be the girl herself?" Della Street asked.

"It won't be. She can't have left. But if it should be, she's about twenty-one or twenty-two, with dark copper hair that's alive, eyes that have plenty of fire, and a peaches-and-cream complexion. She's easy on the eyes. Try and think up some stall which will take her away and give us a chance to get out. Tell her there's someone waiting in the car downstairs who is very anxious to see her. Don't mention any names, but let her think it's the bishop, and see what her reaction is to that."

"Okay," Della said, "don't worry. I'll work out some thing."

"She's dynamite," Mason warned. "Don't start an argument with her because I wouldn't put it past her to start hair pulling."

"Do we switch on the lights?" Drake asked.

"Sure," Mason said.

"Okay, here goes."

"Close the door first," Mason warned.

They closed the door. Drake groped for the light switch and clicked the room into brilliance. Apparently it was exactly as they had seen it earlier in the day. The clothes were piled on the bed, the wardrobe trunk was open in the center of the floor and partially packed.

Mason said in a low voice, "If she did anything, Paul, she did it right after we were here talking with her. You take a look in the bathroom; I'll take the kitchenette."

"Don't forget the big closet behind the bed, either," Drake said. "My God, Perry, I'm afraid to take a look. If we find her dead, it's going to put us in one hell of a spot."

"Are you," asked Perry Mason, "telling me?"

They separated, made a hasty search of the apartment, and met once more by the bed, with sheepish grins.

"Well, Perry," Drake said, "she out-smarted us. Of course, there's a chance she has a friend here in the building and has gone in with her."

Mason shook his head and said, "If she'd been doing that she'd probably have finished her packing so she'd be all ready to come back, grab her stuff and make a dash for it just as soon as the coast was clear. No, Paul, she walked out on us through the back door within five minutes of the time we left the place and before your second man had time to get on the job."

Drake sighed and said, "I guess you're right, Perry. But it makes me sore to think she took me as easily as that. Here I've been sewing the place up tight while she's been on the loose."

Mason said grimly, "Well, we'll go and see the bishop. Della, you go back to the office and stick around. Keep the light on and the outer door open." As he saw the look of inquiry on her face, he said, "I want you to wait for Julia Branner, or Mrs. Oscar Brownley, whatever name she's going under. We'll drive you over to the boulevard and you can get a taxi. Then we'll go on to the Regal Hotel."

Drake left orders his men were to keep a watch of the apartment and report as soon as Janice Seaton returned. They drove Della Street to the boulevard, saw her headed for the office in a cab, and drove directly to the Regal Hotel. In the hotel, Drake looked around in the lobby and said, "I don't see either of the boys here."

"What does that mean?" Mason asked.

"Probably that he's gone out."

"Meeting the Seaton girl somewhere," Mason surmised.

"I'll hunt up Jim Pauley and see if he knows anything," Drake said. "There he is now, over… Hey, Jim!"

The house detective, looking ponderously incongruous in a tuxedo, ducked his bald head in a grinning greeting and came strutting across the lobby. "This Mallory is a Church of England bishop," he said, "and right now he's nursing a mighty sore head. But he's a good sport. He says there is nothing missing and he isn't going to make a squawk about it so we can hush it up. Under the circumstances, we're ready to meet him halfway. By the way, he went out a while ago and left a letter for Mr. Mason."