Luke spends a lot of time during the Black Fleet Crisis trilogy searching for evidence of his mother. He comes across a woman who says she knows of his mother's people. She is one of them, but their society disappeared. She leads him along for most of the 3 books.

Her people are near-humans and they possess knowledge of what they call the...White Current(?), not unlike the Force.

He eventually finds she's been using him to find her people and that his mother was never one of them. Dead end.