Ashes of Regret

Castle, overwhelmed by guilt, sits in a police station interview room. He reflects on his impulsive actions and the consequences they've caused. Determined to rebuild trust, he faces the challenge of redemption head-on.
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This fic was written as part of a drabble/fic challenge prompt provided by 1_million_words on LiveJournal
The prompts are:
<b>A phrase: </b>Nothing left
<b>Words: </b>honesty, guilty
<b>A song title: </b>After the Fire Is Gone
<b>Colour: </b>Light sea green