This is the 15865th most frequent German word.
überraschende
Surprising.
In this sentence, 'überraschende' is an adjective describing the twist ('Wendung') as being unexpected or surprising.
Die überraschende Wendung in der Geschichte hat alle Leser verblüfft.
The surprising twist in the story bewildered all the readers.
Here, 'überraschende' modifies the noun 'Entdeckung', highlighting the discovery as something unexpected or unforeseen.
Sie erzählte uns von einer überraschenden Entdeckung während ihrer Reise.
She told us about a surprising discovery during her journey.
In this instance, 'überraschende' qualifies the noun 'Ankunft', indicating that the arrival of the guest was not anticipated and brought surprise.