This book collects a number of DC's horror anthology titles; namely House of Mystery, House of Secrets, The Witching Hour, and The Unexpected; right at the turn from the Silver Age to the Bronze Age (1969-1970). The adoption of the Comics Code Authority in 1954 basically killed horror comics and led to the "safer" focus on family-friendly superhero comics. By the end of the 60s, artists and readers alike were getting tired of the Code's restrictions, and there was an appetite for a return to the classic horror anthologies of the Golden Age.
These four titles all basically follow the same formula, with 'horror hosts' (Cain for House of Mysteries, his brother Abel in House of Secrets, the three witches in The Witching Hour, and the Mad Mod Witch in Unexpected) introducing short stories and providing some narrative identity to the book through their framing devices. Readers are probably familiar with Cain and Abel from Neil Gaiman's Sandman, and it's cool to see them here developing their mean-spirited chemistry. Despite this nostalgic callback to pre-Code horror titles, however, the presence of the Code still looms over the stories. I wouldn't describe any as particularly scary (most following a formula of ironic comeuppances aping the Twilight Zone), and those that lean more towards horror will often have the horror host pop in at the end to tell the reader that the bad guys got arrested and good triumphed over evil, all in line with Code mandates. (This reminded me of the weird tonal shift at the end of Psycho.)
What's good here is not so much the stories, but the art. This is a real who's who of artists (Alex Toth, Bernie Wrightson, Al Williamson, etc.) who are free in this anthology format to really experiment stylistically. There's some pages here that are absolutely tremendous, popping with psychedelic colors and innovative layout designs. It's just a shame the cheesy stories don't live up to the artwork.
Altogether, this is probably mostly interesting to people interested in comics history, as it is a snapshot of a transition between two "periods" in comics history (not unlike Batman: Red Skies). Again, I wish the DC: Finest collections included some contextualizing essays or introductions, especially for these lesser-known works that have a lot of behind-the-scenes interest.