WELCOME

Constantia Oomen is a California-based author and investigator originally from the Netherlands whose work focuses on pseudoscience, fraud, skepticism, and unresolved mysteries. Her investigations began with the Dutch “paranormal medium” Robbert van den Broeke and his associates, a network that ultimately intersected with the Joran van der Sloot and Natalee Holloway case.

Over the years, Parameter expanded into investigations of the Dutch Skeptic Society, the Neofolk band Darkwood, claims of mediumship and paranormal phenomena, and broader explorations of skepticism, magical realism, and anomalous experiences.

In 2023, Constantia turned her attention to another controversial American mediumship case. More recently, her work has focused on a renewed investigation into the disappearance of Natalee Holloway, including research into St. Anna Cemetery on Aruba.

Constantia is also the author of the true-crime books Genverbranders and Gene Burners: Paranormal Fraud, Casino Fraud, and Murder – Behind the Scenes of Robbert, Stan and Joran, as well as the memoir Another Davis, published in Dutch, English, and German.

Parameter serves as the central archive of her investigations, articles, research notes, books, and ongoing projects.

🇳🇱 Inhoud kan als schokkend ervaren worden
🇺🇸🇬🇧 Content can be experienced as disturbing
🇩🇪 Achtung, der Inhalt kann als schockierend empfunden werden
🇪🇸 El contenido puede experimentarse como impactante
🇫🇷 Le contenu peut être ressenti comme choquant
🇸🇪 Innehållet kan upplevas som chockerande
🇦🇼 E contenido por wordo eksperensiá como algo perturbador.
🇳🇱* Inhoud kin es sjokkerend ervaore waere.

👁️ New – June 9, 2026

🇺🇸🇬🇧 It’s not over yet, for Natalee Holloway
🇳🇱🇧🇪 Het is nog niet voorbij, voor Natalee Holloway
🇦🇼 No a kaba ainda, pa Natalee Holloway

🪦 February 11, 2026

🇺🇸🇬🇧 In Memoriam: William Gazecki (January 14, 1956 – January 11, 2026)
🇳🇱🇧🇪 In Memoriam: William Gazecki (14 januari 1956 – 11 januari, 2026)

🇩🇪 Freitag, 9. Januar 2026, NEU: Another Davis — Leseausgabe

Verfügbar als Leseausgabe (zeitlich begrenztes Angebot – 6 Monate):

Hinweis: Das EPUB ist eine Textausgabe.
Bildintensive Abschnitte (einschließlich der Entangled Edition) sind darin nicht enthalten.

💛 Möchten Sie die Autorin unterstützen?
Sie können:

  • freiwillig entsprechend Ihrer Möglichkeiten via PayPal spenden, oder
  • die Taschenbuchausgabe bei Amazon erwerben.

Zum Beispiel: €0 · €3 (ein Kaffee) · €5 · €10 · €20+

Autorin unterstützen (PayPal)

🇺🇸🇬🇧 Friday, January 9, 2026, NEW: Another Davis — Reading Edition

Available as a reading edition (limited offer – 6 months):

Note: the EPUB is a text-only reading edition.
Image-heavy sections (including the Entangled Edition) are not included.

💛 Would you like to support the author?
You can:

  • optionally donate according to your means via PayPal, or
  • purchase the paperback edition on Amazon.

For example: $0 · $3 (a coffee) · $5 · $10 · $20+

Support author (PayPal)

🇳🇱🇧🇪 Vrijdag 6 januari 2026, NIEUW: Another Davis — Leeseditie

Beschikbaar als leeseditie (tijdelijke actie – 6 maanden):

Let op: de EPUB is een teksteditie.
Beeldintensieve delen (waaronder de Entangled Edition) zijn hierin niet opgenomen.

💛 Wilt u de auteur steunen?
Dat kan:

  • door vrijblijvend naar draagvermogen te doneren via PayPal, of
  • door de papieren editie via Amazon te kopen.

Bijvoorbeeld: €0 · €3 (een kop koffie) · €5 · €10 · €20+

Steun de auteur (PayPal)

🇺🇸🇬🇧 Friday, January 9, 2026, NEW: Gene Burners — Reading Edition

Available as a reading edition (limited offer – 6 months):

Note: the EPUB uses a simplified layout, typical for text-based e-reader editions.

💛 Would you like to support the author?
You can:

  • optionally donate according to your means via PayPal, or
  • purchase the paperback edition on Amazon.

For example: $0 · $3 (a coffee) · $5 · $10 · $20+

Support author (PayPal)

🇳🇱🇧🇪 Vrijdag 6 januari 2026, NIEUW: Genverbranders — Leeseditie

Beschikbaar als leeseditie (tijdelijke actie – 6 maanden):

Let op: de EPUB heeft een vereenvoudigde lay-out, zoals gebruikelijk bij tekstgerichte e-reader-edities.

💛 Wilt u de auteur steunen?
Dat kan:

  • door vrijblijvend naar draagvermogen te doneren via PayPal, of
  • door de papieren editie via Amazon te kopen.

Bijvoorbeeld: €0 · €3 (een kop koffie) · €5 · €10 · €20+

Steun de auteur (PayPal)

🎧 GENE BURNERS IS NOW AVAILABLE ON AUDIBLE & ITUNES – August, 14, 2025
True crime meets the unbelievable — Paranormal Fraud, Casino Fraud & Murder: Behind the Scenes of Robbert, Stan and Joran.

🎧 Also available on iTunes / Apple Books – just search for Gene Burners.

✉️ 🎧 Press & Media
Accredited journalists and reviewers can request a free copy of Gene Burners audiobook for editorial purposes. Please contact me directly for details. (Codes available for listeners in 🇦🇺 🇨🇦 🇫🇷 🇩🇪 🇬🇧 🇺🇸.)

🇺🇸🇬🇧 By the same author, Constantia Oomen Lion Hearts
🇳🇱 Van dezelfde auteur, Constantia Oomen Leeuwenharten