Prospero Lost (Prospero's Children) by L. Jagi Lamplighter

Shakespeare got one thing wrong. The Dread Magician Prospero never drowned his books. More than four hundred years later, Miranda heads the family business. Prospero Inc secretly uses magic for the good of mankind. Only, now, Prospero has gone missing! To save her father, Miranda must reunite with her estranged siblings, each of whom holds a staff of power and secrets about Miranda's sometimes-foggy past. Her journeys, both past and present, take her to Chicago, the Caribbean, Milan, Washington, D.C., and the North Pole. With her is her trusty company gumshoes, Mab, an aerie spirit stuck in a body that looks like Humphrey Bogart. Together, they must survive the mysterious Shadowed Ones if they hope to find Prospero and set all to right again. Humor, mystery, wonder. “Intelligent and eminently enjoyable, this series opener by a first-time author is a first-rate choice for fans of mythic urban fantasy.” – Library Journal (starred review)