XElement.Value is stripping XML tags from content

I have the following XML:

<Message>
    <Identification>c387e36a-0d79-405a-745c-7fc3e1aa8160</Identification>
    <SerializedContent>
        {"Identification":"81d090ca-b913-4f15-854d-059055cc49ff","LogType":0,"LogContent":"{\"EntitiesChanges\":\"
        <audit>
            <username>acfc</username>
            <date>2015-06-04T15:15:34.7979485-03:00</date>
            <entities>
                <entity>
                    <properties>
                        <property>
                            <name>DepId</name>
                            <current>2</current>
                        </property>
                        <property>
                            <name>FirstName</name>
                            <current>camila</current>
                        </property>
                    </properties>
                </entity>
            </entities>
        </audit>\",\"FeatureName\":\"Adicionar Cliente\",\"Operations\":0,\"MachineNameOrigin\":\"VERDE\"}"}
    </SerializedContent>
</Message>

and this code:

[HttpPost]
[ActionName("Message")]
public HttpResponseMessage MessageListener()
{
    var requestString = Request.Content.ReadAsStringAsync().Result;

    try
    {
        var xdoc = XDocument.Parse(requestString);

        var xSerializedContent = xdoc.Root.Element("SerializedContent");    

        var serializedContent = xSerializedContent.Value;

    }
    catch (XmlException e)
    {
        return CreateHttpResponseMessage("Invalid XML. " + e.Message);
    }
    catch (Exception e)
    {
        return CreateHttpResponseMessage(e.Message);
    }
}

The serializedContent from xSerializedContent.Value is this:

{  
    "Identification":"81d090ca-b913-4f15-854d-059055cc49ff",
    "LogType":0,
    "LogContent":"{\"EntitiesChanges\":\"acfc2015-06-04T15:15:34.7979485-03:00DepId2FirstNamecamila\",\"FeatureName\":\"Adicionar Cliente\",\"Operations\":0,\"MachineNameOrigin\":\"VERDE\"}"
}

As we can see the <SerializedContent> is a JSON and inside the JSON I have another XML inside EntitiesChanges. How to avoid the XML tags remotion from the <SerializedContent>?

Expected result:

{  
    "Identification":"81d090ca-b913-4f15-854d-059055cc49ff",
    "LogType":0,
    "LogContent":"{\"EntitiesChanges\":\"<audit><username>acfc</username><date>2015-06-04T15:15:34.7979485-03:00</date><entities><entity><properties><property><name>DepId</name><current>2</current></property><property><name>FirstName</name><current>camila</current></property></properties></entity></entities></audit>\",\"FeatureName\":\"Adicionar Cliente\",\"Operations\":0,\"MachineNameOrigin\":\"VERDE\"}"
}