Ok, so there was this series of books that I absolutely LOVED when I was younger, and I wanna look it up again for the heck of it, but I can't remember the name. I just remember there's this group of kids/teenagers who find out they're all like half-alien or something. They all have silver blood, but it doesn't turn silver up until their... 13th birthday, I think? And one of each of their parents disappeared when they were 4. Oh, and as soon as they find out they have silver blood they also discover they each have some kind of weird ability. Anyone know what I'm talking about?
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