The Maze of Bones - 39 Clues

Dan and Amy Cahill are in a race against time and against their shifty, not-trust-worthy relatives which include the spy Irina Spasky, pop star Jonah Wizard, the overly athletic Holt family, rich snobs Ian & Natalie Kabra, and quiet Uncle Alistair Oh.  They are all on the hunt for the 39 clues which their relative and grandmother, Grace Cahill, left behind.  Their choices were to inherit one million dollars OR follow the clues to an even greater reward.  Many of the Cahill clan choose the million dollars but the rest are in a world-wide race to find the clues and solve the mystery.  Each book in this exciting series is written by a different author of popular fiction for middle-school kids, including Rick Riordan, Gordon Korman, and Patrick Carmen.   

City of Bones

The first installment in The Mortal Instruments trilogy by Cassandra Clare opens as Carly and her good friend Simon visit a club to hear some music.  When Carly witnesses one young man being followed by others into a dark storage area, she makes a bold decision to investigate the situation.  What she finds leads her into an amazing world of adventure and an introduction to a new life as a powerful, supernatural girl whose past remains a mystery.    The trilogy continues with City of Ashes and City of Glass.