I love this place. They have a great selection of science fiction/fantasy books (I assume the mystery selection is good as well, but since I don’t read mysteries I can’t really judge it), knowledgeable staff that can find or recommend things for you, plus author readings, movie nights, and other events. They get involved with offsite events like book festivals and science fiction/comic conventions as well. They usually get authors to sign a few extra books to sell later. I’ve bought several signed first editions here.
While the Redondo Beach location was open (it closed in 2014), it was my first stop for books in the genres they carry, and a must-visit stop when gift shopping for readers. The San Diego location is still around.