"It seems to be inert, my boy. Immobilized." Big Al goes to the tank and gives it a friendly shove. The thousand-pound box tips, and the water inside shivers and sloshes. He could move the tank onstage unaided, but there are union rules, and greater showmanship in the five big stagehands that the feat requires. "In words of one syllable, stuck."

"Something's caught in this wheel here." The young man lowers himself down his crutch, hand under hand, lies on his back, and slides under a corner of the tank's heavy base. There is a rubber-tired wheel, mounted on a steel caster, at each corner. At one corner, something has lodged itself between tire and caster. The young man slips a screwdriver from his tool belt and starts to poke around.

"Al," comes his voice from under the tank. "What's the matter with him today?"

"Nothing, Tom," Big Al says. "He is merely tired. It's the last night of the engagement. And he is no longer as youthful as he once was."

They have been joined, silently, by a small, slender man in a turban. His face is ageless and brown, his eyes dark and sensitive. He has never joined any group, party, or discussion in any way other than silently. Stealth is in his nature. He is laconic and cautious and light on his feet. No one knows how old he is, or how many lives he lived before entering the employ of the Master of Escape. He can be a doctor, a pilot, a sailor, a chef. He is at home on every continent, conversant with the argot of policemen and thieves. There is no one better at bribing a prison guard before a jailbreak stunt to plant a key in a cell, or a reporter to inflate the number of minutes that the Master remained underwater during a bridge leap. He is called Omar, a name so patently corny that it, with the turban and the desert-brown skin, is widely believed by the public to be nothing more than atmosphere, a getup, part of the thrill-making shtick of Misterioso the Great. But if his origins and true name are doubtful, his dusky complexion is genuine. As for the turban, none outside the company know how vain he is about his receding hairline.

"Okay, then what's the matter with you," the young man persists. "You and Omar. You've been acting strange all day."

Omar and Big Al exchange looks. The revelation of secrets is more than anathema to them; it goes against their nature and training. They would be incapable of telling the boy, even if they wanted to.

"Imagination," Omar says finally, decisively.

"Too many pulp novels," says Big Al.

"Tell me this, then." The young man, Tom Mayflower, slides out from under the tank, clutching a black leather button lost from a coat front or a sleeve, embossed with a curious symbol, like three interlinked ovals. "What's the Iron Chain?"

Big Al looks toward Omar again, but his comrade has already disappeared, as silently as he came. Though he knows that Omar has gone to warn the Master, still Big Al curses him for leaving him alone to answer or not answer this question. He takes the button, to whose eyelet a bit of thread still clings, and tucks it into the pocket of his giant waistcoat.

"Two minutes," he says, suddenly as terse as their turbaned friend. "Have you fixed it?"

"It's perfect," Tom says, accepting the great antler hand that Big Al offers, scrambling to his unsteady feet. "Like everything I do."

Later, he will remember this flip reply and regret it with a flush of shame. For the tank is not perfect, not at all.

At five minutes past eight o'clock, Tom knocks. There is a star on the door, and under it, painted on a strip of card, the words "Mr. Misterioso." Tom's uncle, Max Mayflower, has never missed a curtain before. Indeed, his entire act is timed to the half second, tailored and endlessly readjusted to suit the abilities and, increasingly, the limitations of its star. His unheard-of tardiness has caused Big Al to fall silent, and Omar to utter a string of oaths in a barbarous tongue. But neither has the nerve to disturb the man they call Master. It is Miss Plum Blossom, the costumer, who has pushed Tom toward the door. Naturally, the ageless Chinese seamstress is widely believed to be secretly in love with Max Mayflower. Naturally, she is secretly in love with him. There are even rumors about these two and the somewhat misty parentage of Tom Mayflower, but though he loves Miss Blossom and his uncle dearly, Tom takes these rumors for the idle gossip they are. Miss Blossom would never dare disturb the Master in his dressing room before a show either, but she knows that Tom may penetrate certain of the man's mysteries and humors in a way that no one else can. Behind him, she gives another gentle push at the small of his back.

"It's Tom," the young man says, getting no answer. And then takes the unprecedented liberty of opening the dressing-room door unbidden.

His uncle sits at his dressing table. His body has grown fibrous and tough, like a stalk that hardens as it withers. His wiry legs are already clad in the skintight dark blue stuff of his costume, but his upper torso remains bare and freckled, lightly traced with the dull orange wisps that are the sole reminders of the ginger thatch that once covered him. His flaming orange mane has become gray stubble. His hands are wildly veined, his fingers knobbed like bamboo. And yet, until tonight, Tom has never seen a trace in him-not in body, voice, or heart-of the triumph of age. Now he sags, half naked, his bare head gleaming in the lighted mirror like a memento mori.

"How's the house?" he says. "Standing room only. Can't you hear them?" "Yes," his uncle says. "I hear them."

Something, some weary edge of self-pity in the old man's tone, irritates Tom.

"You shouldn't take it for granted," he says. "I'd give anything to hear them cheering that way for me."

The old man sits up and looks at Tom. He nods. He reaches for his dark blue jersey and pulls it over his head, then tugs on the soft blue acrobat's boots made for him in Paris by the famous circus costumer Claireaux.

"You're right, of course," he says, clapping the boy on the shoulder. "Thank you for reminding me."

Then he ties on his mask, a kind of kerchief with eyeholes, which knots at the back and covers the entire upper half of his skull.

"You never know," he says as he starts out of the dressing room. "You may get your chance some day."

"Not likely," Tom says, though this is his deepest desire, and though he knows the secrets, the mechanisms, procedures, and eventualities of the escape trade as well as any man alive save one. "Not with this leg of mine."

"Stranger things have happened," the old man says. Tom stands there, watching in admiration the way the old man's back straightens as he walks out, the way his shoulders settle and his gait becomes springy, yet calm and controlled. Then Tom remembers the button he found lodged in the wheel of the water tank, and runs after his uncle to tell him. By the time he reaches the wings, however, the orchestra has already struck up the Tannhauser overture, and Misterioso has strode, arms outspread, onto the stage.

Misterioso's act is continuous-from first bow till last, the performer does not leave the stage to change costume, not even after the drenching he receives during the Oriental Water Torture Trick. Entrances and exits imply flummery, substitutions, switcheroos. Like the tight costume that promises to betray any concealed tools, the constant presence of the performer is supposed to guarantee the purity and integrity of the act. Thus it causes considerable alarm in the company when-after theroar of applause that follows Misterioso's emergence, unchained, untied, unshackled, right side up, and still breathing, from the Oriental Water Torture tank-the performer staggers into the wings, hands pressed to a spreading stain, darker than water and sticky-looking, at his side. When, a moment later, the water tank is wheeled off by the five union stagehands, sharp-eyed Omar quickly discerns the drizzled trail of water it has left on the stage, which he traces back to a small- a perfect-hole in the glass of the front panel. A pale pink ribbon twists in the green water of the tank.