"[{"field1":"Eva","field2":"29","field3":false},{"field1":"Karen","field2":"32","field3":false}]"

public class Person
{
   public string field1 { get; set; }
   public string field2 { get; set; }
   public string field3 { get; set; }
}

Task<string> jsonString = response.Content.ReadAsStringAsync();
jsonString.Wait();
var model = JsonConvert.DeserializeObject<List<Person>>(jsonString.Result);