vanish into thin air
Advanced (C1)neutral
Disappear completely without explanation.
"The suspect managed to vanish into thin air before police arrived."
Hear it in context

"NASA Connection!" - Disturbing Missing Scientist Case Getting WEIRD | Lauren Conlin • 413
Julian Dorey · 148:41
she appeared to vanish into thin air.

HOW DID THEY DO IT? Confusing Magic Tricks on Got Talent!
Magician's Got Talent · 2:04
the assistant must vanish into thin air.

A particularly wavy matter
CERN · 7:46
and they certainly don't vanish into thin air.

The Forgotten Origins Of Medieval Britain - History Documentary
History Time · 119:22
That many thousands of people don't just vanish into thin air.