Ravenhearst, Serpent of Isis, Strange Cases: Hidden Object Adventure Pack Vol 1. Mystery Case Files HIDDEN OBJECT ADVENTURE PACK: MYSTERY CASE FILES 3: RAVENHEARST, STRAN. Strange Cases: The Tarot Card Mystery. Mystery Case Files: Ravenhearst Rumors surrounding the history of stately Ravenhearst Manor have circulated for decades. The Serpent of Isis: In the early 1900's the legendary artwork, the Serpent of Isis, was stolen at the grand opening of the Egypt Museum in Cairo.