He turned right on the street and headed toward the freeway as the caterwaul of sirens rose in the distance. He didn't speed.

'What're we going to do?' Jillian Jackson asked.

'Get away from here.'

'And then?'

'Get farther away from here.'

'We can't just run forever. Especially when we don't know who or what we're running from – or why.'

Her observation contained too much truth and common sense to allow argument, and as Dylan searched for a reply, he found that he'd become as verbally challenged as she believed all artists were.

Behind Dylan, as they reached the ramp to the interstate, his brother whispered, 'By the light of the moon.'

Shepherd breathed those words only once, which was a relief, considering his penchant for repetition, but then he began to cry. Shep was not a weepy kid. He had wept seldom in the past seventeen years, since he'd been a child of three, when his retreat from the pains and disappointments of this world had become all but complete, since he had begun to live most of each day in a safer world of his own creation. Yet now: tears twice in one night.

He didn't shriek or wail, but cried quietly: thick sobs twined with thin mewling, sounds of misery swallowed before they were fully expressed. Although he labored to stifle his emotion, Shep could not entirely conceal the terrible power of it. Some unknowable grief or anguish racked him. As revealed by the rearview mirror, his usually placid countenance – under his hat of stacked hands, framed by his elbows – was wrenched by a torment as disturbing as that on the face in Edvard Munch's famous painting, The Scream.

'What's wrong with him?' Jilly asked as they arrived at the top of the ramp.

'I don't know.' Dylan worriedly shifted his attention between the road ahead and the mirror. 'I don't know.'

As though melting, Shepherd's hands slid slowly from the top of his head, down his temples, but firmed up again, hardening into fists just below his ears. He ground his knuckles against his cheekbones, as though he were resisting a fearsome inner pressure that threatened to fracture his facial structure, stretch his flesh, and forever balloon his features into a freak-show face.

'Dear God, I don't know,' Dylan repeated, aware of the tremor of distress in his voice as he transitioned from the entrance ramp onto the first eastbound lane of the interstate.

Traffic, all of it faster than the Expedition, raced through the Arizona night toward New Mexico. Distracted by his brother's whimpers and groans of despair, Dylan couldn't match the pace set by the other motorists.

Then good Shep – docile Shep, peaceful Shep – did something that he had never done before: With his clenched fists, he began to strike himself hard in the face.

Awkwardly balancing the potted jade plant on her lap, turned halfway around in her seat, Jilly cried out in dismay. 'No, Shep, don't. Honey, don't!'

Although putting distance between themselves and the men in the black Suburbans was imperative, Dylan signaled a right turn, drove onto the wide shoulder of the highway, and braked to a stop.

Pausing in his self-administered punishment, Shep whispered, 'You do your work,' and then he hit himself again, again.

Having gotten out of the Expedition to allow Dylan O'Conner a degree of privacy with his brother, Jilly parked her not-yet-big butt on the guardrail. She sat with her unprotected back to a vastness of desert, where venomous snakes slithered in the heat of the night, where tarantulas as hairy as the maniacal mullahs of the Taliban scurried in search of prey, and where the creepiest species native to this cruel realm of rock and sand and scraggly scrub were even more fearsome than serpents or spiders.

The creatures that might be stalking Jilly from behind were of less interest to her than those that might approach on the eastbound lanes in synchronized black Suburbans. If they would blow up a mint-condition '56 Coupe DeVille, they were capable of any atrocity.

Although no longer nauseated or lightheaded, she didn't feel entirely normal. Her heart wasn't jumping like a toad in her chest, as it had been during their flight from the motel, but it wasn't beating as calm as a choirgirl's, either.

As calm as a choirgirl. That was a saying Jilly had picked up from her mother. By calm, Mom hadn't meant merely quiet and composed; she had also meant chaste and God-loving, and much more. When as a child Jilly had fallen into a pout or had flung herself high into a fit of pique, her mother reliably recommended to her the shining standard of a choirgirl, and when Jilly had been a teenager excited by the smooth moves of any acne-stippled Casanova, her mother had suggested somberly that she live up to the moral model of the oft-cited and essentially mythical choirgirl.

Eventually Jilly in fact became a member of their church choir, partly to convince her mother that her heart remained pure, partly because she fantasized that she was destined to be a world-famous pop singer. A surprising number of pop-music goddesses had sung in church choirs in their youth. A dedicated choirmaster – who was also a voice coach – soon convinced her that she was born to sing backup, not solo, but he changed her life when he asked, 'What do you want to sing for anyway, Jillian, when you've got such a big talent for making people laugh? When they just can't laugh, people turn to music to lift their spirits, but laughter is always the preferred medicine.'

Here, now, along the interstate, far from church and mother, but longing for both, sitting as straight-backed on a steel guardrail as ever she had sat on a choir bench, Jilly put one hand to her throat and felt the systolic throb in her right carotid artery. Although the beat was faster than the pulse of a devout choirgirl calmed by hymns of divine love and by a beautifully raised Kyrie eleison, it didn't race with outright panic. Instead it counted a quick cadence familiar to Jilly from several early turns on comedy-club stages, when her material had not connected with the audience. This was the hurried heartbeat of a rejected performer when humiliating minutes remained in the spotlight before a hostile crowd. Indeed, she felt that telltale clamminess on her brow, that damp chill on the nape of her neck, in the small of her back, and on her palms – an icy moistness that had but one name dreaded from the high proscenium arches of Broadway to the lowest stages of boondocks honkytonks: flop sweat.

The difference this time was that the troubled heartbeat and the cold sweat weren't merely the consequences of her standup-comedy act collapsing under her, but arose from a dreadful suspicion that her life might be falling apart. Which would make this the ultimate flop sweat.

Of course, maybe she was being melodramatic. More than once she had been accused of that tendency. Yet undeniably here she sat in a desolate desert, far from anyone who loved her, in the company of a decidedly odd pair of strangers, half convinced that any authorities to whom she turned would prove to be in league with the men who had blown up her cherished Cadillac. Worse, with every heartbeat, her blood carried an unknown corruption deeper into her tissues.

On consideration, she realized that in this instance, reality involved more frantic action, inspired more exaggerated emotions, and encouraged less respect for cause and effect than any melodrama ever staged. 'Melodramatic, my ass,' she muttered.

Through the open back door of the Expedition, Jilly had a clear view of Dylan O'Conner sitting beside Shep and talking – ceaselessly, earnestly talking. The roar and whistle of passing traffic prevented her from hearing anything he said, and judging by Shepherd's faraway gaze, Dylan might as well have been alone, bending no ear but his own.