Hot- | Download- Byhss Ly Tyz Mhjbt Fy Almykrwbas Wty...

Her partner, Leo, leaned over. "Looks like an Atbash cipher, maybe with a shift. 'byhss'... if I shift each letter back one—'axgrr'? No. Try Atbash: 'ybshh'? Still nothing."

"Leo," she said quietly, "trace this download. And cancel my evening plans." HOT- Download- byhss ly tyz mhjbt fy almykrwbas wty...

But given the last part almykrwbas — Atbash of that: Her partner, Leo, leaned over

Mira froze. That was her old CIA handler’s voice — the one who'd been declared dead three years ago. " she said quietly

It might be a keyboard shift pattern (e.g., each letter typed with hands shifted one key to the left on QWERTY).