ForeverYA: Secret Letters by Leah Scheier

Inquisitive and observant, Dora dreams of escaping her aristocratic country life to solve mysteries alongside Sherlock Holmes. So when she learns that the legendary detective might be her biological father, Dora jumps on the opportunity to travel to London and enlist his help in solving the mystery of her cousin’s ransomed love letters. But Dora arrives in London to devastating news: Sherlock Holmes is dead. Her dreams dashed, Dora is left to rely on her wits—and the assistance of an attractive yet enigmatic young detective—to save her cousin’s reputation and help rescue a kidnapped heiress along the way.
 
Steeped in Victorian atmosphere and intrigue, this gripping novel heralds the arrival of a fresh new voice in young adult literature.

NOTE: ForeverYA will also be discussing Sweethearts by Sara Zarr

As children, Jennifer Harris and Cameron Quick were both social outcasts. They were also one another's only friend. So when Cameron disappears without warning, Jennifer thinks she's lost the only person who will ever understand her. Now in high school, Jennifer has been transformed. Known as Jenna, she's popular, happy, and dating, everything "Jennifer" couldn't be---but she still can't shake the memory of her long-lost friend. When Cameron suddenly reappears, they are both confronted with memories of their shared past and the drastically different paths their lives have taken.From the National Book Award nominated author of Story of a Girl, Sweethearts is a story about the power of memory, the bond of friendship, and the quiet resilience of our childhood hearts.