Fourteen-year-olds Ananka Fishbein, Kiki Strike, and the other Irregulars encounter a Chinese mummy, a ghost, trained squirrels, and old enemies as they try to stop an art forgery ring and safeguard the secret streets hidden beneath New York City.

"What's the best gift for a kid who's turned 10? Everything they need to know! Ten is a major year in every kid's life. It's when they finally reach double digits-and that means more freedom and responsibility. It also means there's a ton of stuff to learn, and some of it's pretty important. Inside this hilarious handbook is the information kids need to make 10 one of the best years of their lives-from the fun, to the serious and the downright disgusting"--...

While Kiki Strike is in Paris trying to stop her evil cousin, the princess Sidonia, from all sorts of terrible deeds, it is up to Ananka and the other Irregulars to help Kiki find the cure for baldness, foil the evil plans of Oona's twin, and keep Anankaherself from falling in love with the wrong young man.