How to get value by key in json?

Question

JSON

I know it's a stupid question, but I can't get the key by value from this json.

I'm trying to do this with Newtonsoft, but it doesn't work.

var json = JsonConvert.SerializeObject(result);

        var title = JObject.Parse(json)["title"];

        print(title);

Gives an error message:

JsonReaderException: Error reading JObject from JsonReader. Current JsonReader item is not an object: String. Path '', line 1, position 456.

JSON: