From Protector of the Grey House:
The spot on the floor stared back up at her when she opened her eyes. She frowned, knelt, and touched the spot. Dried blood. She glanced further up the walkway and realized the irregular blood trail would lead the way. Natalia chewed her lip and wondered whose blood it was as she started down the hall. She heard her name being called through the wall as she followed the trail. She ignored it and jogged through the maze sure the voice was Joseph’s. Natalia knew he would be able to follow her through here. Probably created it with Vincent or for Vincent. To not lose her way, Natalia took a deep breath, and followed the blood trail.
It led to a door with another lit keypad. She entered Vincent’s code as Joseph bellowed her name in the room from the other entrance. The door slid open, and she took two steps in. She entered Vincent’s code into the next keypad and waited for the door to close as she bounced from foot to foot. She took a chance and entered a random set of numbers. The keypad blinked red. She waited for the light to return to normal, then entered in another random sequence. The keypad flashed red, then went back to its normal hue. She waited another second, then entered another set of numbers. This time the keypad flashed and went dark. Natalia closed her eyes, turned, and ran up the stairs. That ought to buy her a little time.