Signed in Blood: The Letters Police Ignored

Killer Signs His Murders With Letters Police File Away as Pranks: The Serial Homicides of Wolfgang Abel and Marco Furlán

November 1980. A letter arrives at an Italian newspaper signed "Ludwig" describing three unsolved murders with classified details no one outside the crimes could know. The police read it, note the impossible accuracy, and dismiss it as a hoax. Over the next four years, Ludwig will claim thirteen more victims across four countries-sending physical evidence, technical specifications, and architectural diagrams with each killing.

In this investigation, we uncover how two brilliant university students built their own cosmology of murder while operating completely invisible to authorities who received direct confessions in the mail. We explore the contradiction between perfect forensic correspondence and institutional blindness, the targeting of marginalized victims invisible to investigators, and why it took seven years to connect letters that authenticated every detail of violent acts.

Victim: Wolfgang Abel, Marco Furlán (perpetrators); Multiple victims including Guerino Spinelli, Luciano Stefanato, Claudio Costa, Alice María Pareta, Luca Martinotti, Mario Lovato, Giovanni Batista Pigato, Father Armando Bisón, and victims of the Heros cinema fire
Date: 1977-1984
Location: Verona, Padua, Venice, Vicenza, Trento, Milan, Italy; Amsterdam; Munich
Status: Convicted, escaped, recaptured

- Four Molotov cocktails thrown at a sleeping man's car in 1977, detail confirmed only in a letter the police filed away as a prank
- Hammer and axe murders described with brand names, colors, and weights before forensic analysis could verify them
- A fire at a Milan cinema set using a fuel mechanism so specific the perpetrator's letter matched technical blueprints the police had not released
- Two young men in Nazi costumes caught at a nightclub the same night investigators finally connected the correspondence to the crimes

Wolfgang Abel, Marco Furlán, Guerino Spinelli, Luciano Stefanato, Claudio Costa, serial killers, unsolved murders, Italian true crime, investigation failure, homicide investigation, criminal minds, forensic evidence, true crime English

To listen to this podcast ad-free and access premium episodes, try our subscription with a 14-day free trial at obomedia.com.

© 2026 OBOMEDIA. All rights reserved.
This episode and its content (audio, text, and related materials) are the exclusive property of OBOMEDIA and are protected by applicable copyright laws. Reproduction, distribution, editing, or commercial use, in whole or in part, without prior written permission from OBOMEDIA is prohibited. For permissions, licensing, and business inquiries: business@obomedia.com.

To listen ad-free and access premium episodes, start your 30-day free trial at obomedia.com

OBOMEDIA presents true crime storiesa true crime podcast built on real cases.

Every true crime story in our crime files follows the crime investigation from the missing person report to the trial: investigators and police building a murder case, a police investigation gone cold, justice for the victim and those who survived.

We open the unsolved murder, the cold case reopened decades later, the mysterious death, the disappearance, the serial killer, the family murder, the murder mystery; the missing persons a missing woman, a missing girl, a missing man found dead and the missing and murdered.

From the infamous case to the unsolved case, from classic true crime to dark true crime and disturbing true crime: true crime reports, real crime stories, real murder cases, true murder stories and unsolved mysteries one true crime case at a time, from the OBOMEDIA true crime vault.

© 2026 Created with OBOMEDIA technology. All rights reserved. This episode and its content (audio, text and related materials) are the property of their respective creator and are distributed under the OBOMEDIA name on platforms such as Apple Podcasts, Spotify, Amazon Music and Pocket Casts. Reproduction, distribution, editing or commercial use, in whole or in part, without prior written permission is prohibited. For permissions, licensing and business inquirie