thief in the night

A person or thing that moves in a swift and secretive, stealthy, or surreptitious manner. The cancer spread through my lungs and into my bones like a thief in the night, giving me no chance of beating it.

Common Names:

Name	Pronounced	Usage
Karin	['ka:rin]
Candelario	kahn-de-LAH-ryo	Spanish
Micaela	-	Italian, Spanish, Portuguese
Nymphodora	-	Ancient Greek
Usagi	oo-sah-gee (Japanese)	Popular Culture
Turid	-	Swedish, Norwegian, Danish