Liar!

Description for LIAR! by Fern Michaels:

Luna Bodman always looks forward to a new shipment of furniture at the restoration shop. Her brother, Cullen, has a knack for finding discarded pieces with an intriguing history, and Luna likes to sit with each item to see if she can feel any kind of vibrations. Usually, Cullen does his thing while Luna does hers, but the arrival of an old armoire triggers a reaction in Luna that's impossible to ignore.

From the moment Luna wiggles inside the armoire and closes her eyes, she feels an overpowering and disturbing sensation. Emerging, she asks for a flashlight and discovers words scraped into the wood: “Help me!” Hoping to uncover the piece's secrets, Luna contacts her good friend, U.S. Marshall Christopher Gaines, and the group sets out to trace the armoire's origins. The journey takes them to a military school in New England, and a mysterious, long-ago ransom case. The kidnappers were never found, but decades later, the answers may finally be within reach . . .

This is #3 in Lost and Found Series.