The Investigator's Apprentice: The Chronicles of Brother Hermitage Book 24

The Devil's in the Daughter: A Dawson and Patel Investigation – Book One (Dawson and Patel Investigations)

The Rhodian Mole: A Phryne & Fran Investigation, Book One (Phryne & Fran Investigations)

Paranormal Investigation: The Black Book of Scientific Ghost Hunting and How to Investigate Paranormal Phenomena

Advice for a Young Investigator (A Bradford Book)

The Investigator Coloring Adventure: Coloring Book For Kids

Investigation (Enforcer's Series Book 6)

Tangled Webs (Chase Investigations Book 4)

Third Child: A Clara Tinder Investigative Journalist Thriller: A Clara Tinder Investigation Thriller Book One: 1 (Clara Tinder Investigative Journalist Series)

The Crow Investigations Series: Books 4-6

The Soul Trade: Judas Investigations: Book One

South America: A 4D Book (Investigating Continents)

Ghost Hunting Log Book: Ghost Hunting & Paranormal Investigation Log Book Journal, Paranormal Activity Journal, Paranormal Investigation Notebook, ... for Investigators and Paranormal Enthusiasts

Black Mirror (The Paranormal Investigator Book 6)

The horror of River Atro: An investigative game book

Investigation Adventures: A Simple and Engaging Coloring Book

The Circle: A Val Buchanan Investigation Book Nine

Miss Hewitt Investigates a Haunting: Miss Hewitt Investigates Book 25

TRAPPED: Sheppard & Sons Investigations: Sheppard & Sons Investigations, Book 6

The Crow Investigations Series: Books 1-3

Fluid: A Mindspace Investigations Novella (Book #4.5)

Subversion in Pompeii (Argolis Investigations Book 3)

Third Woman: Elvira Slate Investigations Book 4