Her name isn’t really Darcy, of course: her true name is something much older and a damn lot more powerful. Norse gods weren't the only supernatural beings in New Mexico when Thor was there.

Sherlock has just run off in a whirlwind of coat without a word, leaving Scotland Yard cursing his name. It’ll be a while before they can get someone to translate this, and meanwhile that tall know-it-all bastard has gone off to do god-knows-what without bothering to even tell them what the note says. John edges forward in the middle of the uproar, and surreptitiously glances at the note. Androvy, it says briefly. The warehouse at five. Serdyukov. John seems like such an ordinary bloke. Appearances can be deceptive.

Loki falls from the Bifrost, and lands in Lilo's garden. Chaos ensues.