In the control room at S.T.A.R. Labs, the clatter of keyboards merged into a rapid downpour.
Felicity and Cisco sat side by side before the enormous wraparound screen, their fingers blurring over their keyboards. Hundreds of data feeds, satellite surveillance images, and traffic recordings cascaded across the screen.
"This isn't right." Cisco raked a hand through his hair and crushed an empty energy drink can.
"Roy G. Bivolo and George Harkness's movements are two completely parallel lines. No shared contacts, no financial transactions, not even any overlap in the neighborhoods they frequent."
"The A.R.G.U.S. database doesn't have any recent entry records for Harkness either." Felicity adjusted her black-framed glasses, fatigue showing in her eyes.
"It's like he crawled out of the ground. Central City is huge. If they're deliberately hiding, searching the surveillance footage will take at least forty-eight hours."
Barry leaned against a lab bench, his left shoulder already bandaged. Oliver sat in a chair nearby, waxing his bowstring. Neither spoke, and the atmosphere was subdued.
"Make some room."
A calm voice cut in. Carrying a steaming cup of green tea, Yang Ming walked between them.
Cisco stopped typing. "Doctor Yang, we're running a cross-comparison algorithm. This takes time..."
"You're looking in the wrong direction." Yang Ming took a sip of tea, his gaze settling on a secondary screen nearby. It displayed several lines of lab results on the boomerangs' composition.
"What?" Felicity stared.
"To find someone, you don't necessarily need to trace where they've been." Yang Ming reached out with his free left hand and tapped a few keys, bringing up the materials report. "Look at toxicology and materials science."
He pointed to a molecular formula on the screen.
"There are traces of sulfur hexafluoride and a particular titanium-cobalt alloy byproduct on the boomerang's surface. When Roy robbed