Drift is under the impression that orb is certainly this mysterious book (he has taken to calling it the Borb along with everyone else who has given up on offering any gravitas to what they do) and expressed his concern if it's not directly with Hortensia's remains it's on her property. Combination locks are always a riddle with extra steps, and would gladly brainstorm with Sabriel, the devil in the details, before partaking in some old fashioned breaking&entering

Had he throw out the obvious astrological nature of the Day family naming conventions as a starting point for the combination?