I’m writing a scene where my MC (and her sidekick) is searching the antagonist’s house in an attempt to find the MacGuffin. I want the scene to be tense: will she get caught by him returning, will she find the MacGuffin, what might she find instead?

At the moment I don’t think there’s much tension in the scene – just a bit of ‘cripes, we should hurry before he returns’ - any tips on how to create it?

(BTW she’s searching a modern house so there’s no scope for creaking windows etc)

Ta muchly.