Parents need to know that The Reluctant Assassin is the start of a new series from the author of the bestselling Artemis Fowl series, so many kids will want to read it. The publishers recommend this exhilarating time travel read for ages 12 and up, but it seems a better fit for teens who've already digested many high-action, high-violence PG-13 movies. The villain isn't the reluctant assassin -- he's very willing to kill and does it often, both for hire and for himself, with some gory detail. His assistant, 14-year-old Riley, is the reluctant one. Riley and Native American Chevie (hooray for girls in sci-fi!) face nonstop danger, including kidnapping, fighting for their lives in an arena, poisoning, and more. There's lots of talk of how they were orphaned and a view of a London slum with despair and death all around. Both Riley and Chevie are resilient characters who use serious smarts to stay ahead of the killer on their tail.