The Blue Blood vampires are back, but the world now looks very different. When Schuyler wakes up in New York City, she's disoriented. Last she remembers, she was in London, where she defeated Lucifer but lost her love, Jack. She soon realizes that this New York is not the same one she remembers, and even her reflection in the mirror looks different, although she is still a half vampire. She's in an alternate universe where it's 2020, a pandemic is raging, her mom is a completely different person, Lucifer is still alive and mayor of the city, and Jack is alive, too--but he doesn't even know Schuyler. Turns out Schuyler isn't the only one with memories of the other world; her friend Kingsley remembers it, and he believes it's up to Schuyler to defeat Lucifer…again. Schuyler's old world comes from the original Blue Bloods series, but this new entry functions as a reboot and spinoff, inviting in new readers. However, because of the ties to the previous books, a lot of information is introduced at the beginning, slowing things down. Although there's some fun action, the worldbuilding of this latest story is underdeveloped. The cast includes more diversity than before: Schuyler and best friend Oliver are now multiracial (other leads are White), and Kingsley has a male love interest--but all the characters are bland and one-note. The sequel-bait open ending is also unsatisfying. Unlikely to thrill readers of the original series or draw in new fans. (Paranormal. 12-18) Copyright (c) Kirkus Reviews, used with permission.