In that case.
At another time.
For that reason; therefore.
At that time.
Next or immediately afterward.
Then, let her hear it. – The Complete Project Gutenberg Works of George Meredith by George Meredith
Then won't you come to me? – Masters of the Wheat-Lands by Harold Bindloss
What would your mother have said then? – The New Magdalen by Wilkie Collins