The next morning, Jay stumbled into the bustling bullpen, his eyes weighed down by heavy bags—testaments to a sleepless night.

Ruzek glanced up from his desk. "Jay, man, you look like you wrestled a bear last night."

Jay managed a half-hearted smile. "More like a pack of wolves."

Burgess leaned over, concern etching her features. "Trouble sleeping?"

He nodded, avoiding eye contact. "Yeah. Just…thinking."

Voight, ever observant, studied Jay. "Upton's departure hitting you hard?"

Jay's jaw tightened. "Yeah. Something like that."

Torres chimed in, trying to lighten the mood. "Maybe you need a vacation. Somewhere warm. With no cases."

Jay's laugh was bitter. "Vacation? Right."

As the room buzzed with activity, the empty chair at Hailey Upton's desk seemed to echo the void left behind.

The bullpen buzzed with the monotonous rhythm of paperwork—the detectives hunched over their desks, scribbling notes, filling out forms. But Jay Halstead's patience had worn thin.

Ruzek glanced up from his desk, eyebrows raised. "Jay, man, what's eating you?"

Jay snapped, "Misplaced files, typos, and rookie questions. That's what."

Burgess leaned over, her tone gentle. "We're all on edge, Jay. Hailey's departure hit us hard."

He glared at Torres. "Yeah, well, some of us handle it better than others."

Voight, observing from his office, had seen enough. He beckoned Jay inside, the door closing with a soft click. The captain's gaze was stern, his voice low.

"Go home, Halstead. You're no good to anyone like this."

Jay's protest died on his lips. He nodded, defeated, and walked out of the bullpen.

Jay Halstead stirred from his restless sleep, the phone's shrill ring cutting through his exhaustion. He fumbled for it, squinting at the caller ID. Voight.

"Jay," Voight's voice was urgent, "we've got one of Sean O'Neil's girls on the roof. We need someone to talk her down."

Jay's heart raced. Sean O'Neil—the notorious mobster. His daughter teetering on the edge.

Hey," Jay's voice carried across the rooftop, gentle but firm. "I'm Detective Halstead. You don't have to do this. Let's talk."

The girl's eyes widened, fear etching her features. "Stay back! I'll jump!"

Jay took a step forward, hands open. "I'm not here to hurt you. Your father—Sean O'Neil—he's worried. Let's find a way out of this."

The wind howled, drowning out her sobs. Jay's heart raced.

Jay's heart clenched as the girl's words hung in the air like a blade. "He's not my dad," she whispered, her voice raw. "He killed my mom."

Jay's mind raced. Sean O'Neal—the seemingly two-faced villain who had infiltrated their lives. The daughter of a monster, caught in the crossfire.

"Listen," Jay's voice was steady, desperate. "I know it hurts. But you don't have to end it this way. We can find justice. You're not alone."

The girl's eyes flickered, torn between despair and hope. And then, before Jay could reach her, she stepped back, her scream swallowed by the wind. She fell, disappearing into the darkness below.

Jay's breath caught in his throat as he peered over the edge.

The room was dim, the city's distant hum seeping through the window. Jay Halstead sat on the edge of his bed, phone plugged in, waiting. Hailey Upton—the ghost of her departure—loomed over him. He'd replayed their last conversation a thousand times, hoping for a different ending.

As exhaustion finally claimed him, he drifted into a restless sleep. Dreams of rooftops and desperate pleas haunted him. And then, in the early hours, his phone blared to life—a shrill ring that cut through the darkness.

His heart leaped. Hailey? But the caller ID shattered his hope: Sean O'Neil—the man who had taken everything from them.

Jay's fingers trembled as he answered. "What do you want?"

And Sean's voice, cold and calculated, echoed through the room, a cruel twist of fate.

Sean's voice, cold and calculated, cut through the silence. "Halstead, you think you can save everyone? Even the broken ones?"

Jay clenched his jaw. "What do you want?"

"Your partner," Sean's tone dripped with malice. "The one who slipped through my fingers. Bring her back, and maybe—just maybe—I'll leave you alone."

Jay ended the call, and fell back to sleep.