Read the text. The figure of speech is shown in bold.

But finally there was one last curve, the poplar trees ended, and Rosalind’s fears were realised. ‘Daddy, that’s not a cottage.’
‘No, I agree. That’s a mansion.’
And so it was, a huge mansion crouching in the middle of formal gardens.
From Jeanne Birdsall, The Penderwicks: A Summer Tale of Four Sisters, Two Rabbits, and a Very Interesting
Boy. Copyright 2005 by Jeanne Birdsall