What species and how large?
If arboreal check curtains. If terrestrial check shoes and tight dark spaces at floor level.
If all else fails then rip your house to shreds.
An escapee is always tricky to find.
She is an Australian Bird Eating Tarantula and probably about a 10cm leg span...
So best to check lower levels and dark spaces?
That's about right. Nothing but luck. I've only ever seen one person on this forum find a tarantula after actually looking - the rest found the tarantula by simply noticing it in a corner one day after having given up the search. That vast, vast majority never get found.There aren't some sort of insider tricks, IMO it's always, no matter, a question of pure finest luck. Search.
Yeah, bit of a solace (if we can talk about solace) is that both the Theraphosidae and the owner are Australian therefore, in the scenario (who knows, at the end?) of a true-from the house-papillon escape, wouldn't harm too much the environment (well, assuming the keeper lives in the country, at least).