Double Trouble Squared — Kathryn Lasky

All four Starbuck twins can teleflash -- talk to each other without saying a word aloud. Yet simple teleflashing takes a frightening and ghostly turn when a mysterious voice begins to speak to the older twins, Liberty and July. Who is trying to contact them and why? Using the detective skills of their hero, Sherlock Holmes, the twins set out to solve a puzzle that becomes a suspenseful and exciting journey through the streets and neighborhoods of London.

In this first book of the Starbuck Family Adventure Series, Kathryn Lasky takes readers on a thrilling chase through alleys and attics, as the Starbuck twins follow the trail of a spooky mystery. Kathryn Lasky is the author of numerous prize-winning books for young readers, including The Night Journey and The Bone Wars. While writing Double Trouble Squared, she traveled to London, where she retraced the routes of the greatest detective ever, Sherlock Holmes.