in src/aws_secretsmanager_caching/secret_cache.py [0:0]
    def get_secret_string(self, secret_id, version_stage=None):
        """Get the secret string value from the cache.
        :type secret_id: str
        :param secret_id: The secret identifier
        :type version_stage: str
        :param version_stage: The stage for the requested version.
        :rtype: str
        :return: The associated secret string value
        """
        secret = self._get_cached_secret(secret_id).get_secret_value(version_stage)
        if secret is None:
            return secret
        return secret.get("SecretString")