Barry,

You need todo a multi index search

private MultiIndexSearcher searcher;

searcher = WebHelpers.GetMultiSearcher(new[] {"index1", "index2"}); //replace with your indexers

        public static MultiIndexSearcher GetMultiSearcher(string[] indexes)

        {

            var directories = new List<DirectoryInfo>();

            foreach (var index in indexes)

            {

                var indexer = ExamineManager.Instance.IndexProviderCollection[index];

                var dir = new DirectoryInfo(((LuceneIndexer)indexer).LuceneIndexFolder.FullName.Replace("\\Index",""));

                directories.Add(dir);

            }

            var i = new MultiIndexSearcher(directories, new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_29));

            return i;

        }

The method i have to get the indexers is not optimal sure there is a better way of getting the directories on the bit (LuceneIndexer)indexer) im sure if you cast it to UmbracoBaseIndexer you can get the directory path of index? Anyhow what I have definately works as I am using it on a site where I am searching across umbraco and database indexes.

Also what you may want todo to make queries less terse is use GatheringNodeData event on each index and munge all the fields into new field called content then your query will be short and sweet!

Regards

Ismail