The Castle Sisters and the Impossible Darkness

Faith and Summer Castle are the ultimate crime fighting duo.
And they're not even old enough to drive.
Faith has the super smarts and Summer brings the super brawn.
The forces of darkness are gathering and the battle between good and evil has reached a pivotal turning point. When their Uncle gets kidnapped by the evil Agent Dark and the mysterious organization known only as the Tancredi Group, the Castle Sisters find themselves in the middle of that very battle. It's an adventure that will take the sisters from the concrete jungles of New York, to the frozen wastelands of the arctic, and to dimensions beyond our own. The fate of the world may hang in the balance, but it's just another day for the Castle Sisters. __________________________ Included in this book are all five installments, originally available only for Kindle readers: Book #1 - The Impossible Rescue
Book #2 - The Arctic Isle of Doom!
Book #3 - The Invasion of the Imaginary Friend
Book #4 - The Mall of Eternity
Book #5 - The Doomsday Device