* macabre (adj.) - relating to or characterized by death or the dead, especially in a gruesome or sinister way
* fortuitous (adj.) - happening by chance in a favorable or beneficial way
* trepidation (n.) - a feeling of fear, nervousness, or agitation
Chapter 2: The Secret Passage
* abysmal (adj.) - extremely bad or severe; profound
* elusive (adj.) - difficult to catch, grasp, or understand
* ominous (adj.) - giving the impression that something bad or unfortunate will happen
Chapter 3: The Hidden Room
* claustrophobic (adj.) - relating to or suffering from claustrophobia, the fear of being in confined spaces
* dissipate (v.) - to scatter, disperse, or fade away
* ephemeral (adj.) - lasting for a very short time; temporary
Chapter 4: The Ghostly Encounter
* apparition (n.) - a ghost or other supernatural appearance
* ethereal (adj.) - extremely delicate, light, or airy; spiritual
* specter (n.) - a ghost or other supernatural being that is seen as a vague, shadowy figure
Chapter 5: The Curse of the Mansion
* antediluvian (adj.) - belonging to or characteristic of a time before the Great Flood
* antedote (n.) - a remedy for or preventive of a disease or poison
* incantation (n.) - a magic spell or charm, typically consisting of words or sounds recited in a specific way
Chapter 6: The Mystery Solved
* concoction (n.) - a mixture of various ingredients, especially one made by mixing different liquids
* decipher (v.) - to make sense of or interpret a code, cipher, or cryptic message
* revelation (n.) - the disclosure of something previously unknown or kept secret