This list contains all the secrets as they can be found in the version 1.18 of Thief II. Secret objectives -as far as they are known so far- are also included in this list. To enlarge the screenshots for a better view, click on them.
List of the Secrets in "Trail of Blood"
There are no regular secrets in this mission, I am afraid.
Secret Objective: You have collected more than 1000 loot. Not bad for a creepy and strange place as this one.