Excerpt: 'The 39 Clues Book 4: Beyond the Grave'

July 1, 2009— -- Follow the latest adventure of siblings Amy and Dan, as they travel the world solving a trail of clues that will lead them to the source of their family's power.

In Book 4 of the "39 Clues" series, Amy and Dan search to figure out what's behind the rivalry between the Tomas and Ekaterina branches of the Cahill family. Unfortunately, it could take them into enemy territory.

Read an excerpt of the book below and head to the "GMA" Library for more good reads.

Pp. 110-112

There was a loud clang as the iron tomb door shut completely. The lights immediately went out. "Amy?" Dan whispered.

"I'm right here." Amy only knew Dan was inches away by the sound of his voice. It was so dark she couldn't see her own hand. She fought down panic. The darkness pressed against them like a living thing.

Dan felt his breath catch. Amy grabbed his hand. Normally, Dan would have pulled his hand away and said something like "Ew," but just then his sister's fingers felt good, even if they were kind of sweaty.

"Somebody shut the door," Amy whispered.

"Thanks for the tip, Miss Obvious," Dan whispered back. Suddenly, he heard a noise. Was it a footstep? Shuffling, as if a foot was being dragged along the dusty ground. As though wrappings were dragging behind . . . "Did you hear that?" Amy whispered.

"No," Dan lied.