It has always felt like a failure that Bjorn and I couldn't keep our family together. You never get it back but to this day I don't regret splitting up. The reason behind our separation is one of those things I definitely don't want to go into!
With improvisation I just do it. It might be a total failure but then you just throw the dice again.
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I made a very conscious effort to finish 'The Cypress House' before 'So Cold the River' launched because I thought that would help build a buffer between my writing and any impact that came from either the success or the failure of that first book.