The third book in the "Wild Cards" series by George R.R. Martin (editor), this is a "shared world" series, where various authors get together and write in the same world. The world is one where an alien virus was dumped into the air shortly after WWII, and still randomly infects people nearly forty years later.
The virus - called the Wild Card for its very random results - proliferated in earth's atmosphere. First, nine in ten people who contract the Wild Card virus "draw the Queen of Spades," and die. Of the survivors, nine in ten people "draw a Joker," and end up hideously disfigured. Of the non-Joker survivors, some draw a "deuce," and get a power or ability that's pretty much useless ("I can change my hair colour at will!"), but many who survive as non-jokers "draw an Ace," and gain super-powers. The massively telekinetic Turtle, the projective teleporter Popinjay (who I really liked in this book), the any-lizard shapeshifter Kid Dinosaur - these are some of the Aces. They're solid, fun to read, and quite well drafted.
This story all takes place in one day, and the novel is very well sewn together (especially given the different tones and styles of the various authors) and has a very complicated and complex interwoven plot. Kudos to Martin for wrapping it up so well.
This forty years later is the anniversary and what is likely to be the largest "Wild Card Day" celebration ever - except one recurring villain is using this day to kill off all the Aces who bested him in the previous books... Who will survive?
As Martin is well known for in his "A Song of Fire and Ice" series - there are no holds barred in these books - heroes die. And horribly. Very solid stuff.