That’s a tricky request! You’re asking for a spoiler for a fictional “Tatort aus Stuttgart | Lannert und Bootz” episode using the title of a *different* Tatort episode (“Tatort Münster”). This is inherently contradictory; you can’t spoil a Stuttgart Lannert & Bootz episode with details about a Münster episode. To write a meaningful spoiler, I need information about a *fictional* Stuttgart Lannert & Bootz case.

However, I can provide a sample 500-word spoiler *as if* a Stuttgart Lannert & Bootz episode existed and we could spoil it:

**Spoiler für “Tatort aus Stuttgart | Lannert und Bootz”: Der Fall des Schwarzen Engels**

The seemingly idyllic world of Stuttgart’s elite is shattered when renowned art collector, Baron von Hess, is found dead in his meticulously curated gallery – a single, black feather clutched in his lifeless hand. Initially dismissed as a heart attack, Lannert and Bootz quickly uncover a web of deceit far more sinister than a simple cardiac arrest. The feather, a calling card of sorts, points towards a shadowy organization known only as “Der Schwarze Engel” (The Black Angel).

The investigation leads Lannert and Bootz down a rabbit hole of clandestine art deals, forged documents, and a shocking history of theft stretching back decades. They discover that the Baron’s collection, famed for its exquisite Renaissance paintings, was built on a foundation of illicit acquisitions – pieces stolen during the war and laundered through a complex network of contacts. The real value of the collection lay not in the artwork itself, but in its provenance, a secret the Baron guarded fiercely, and one that someone was willing to kill for.

Their prime suspect, initially a disgruntled former associate of the Baron named Klaus Richter, a charming but ultimately ruthless art restorer, is quickly ruled out. Richter’s alibi, meticulously crafted, holds up under intense scrutiny. However, Lannert’s persistence unveils Richter’s connection to a mysterious woman, Isabella Moreau, a seemingly innocent art historian with a surprising past. Moreau, it turns out, is a key figure in Der Schwarze Engel, using her expertise to authenticate stolen artifacts and seamlessly integrate them into legitimate collections.

The investigation climaxes in a tense standoff at the Staatsgalerie Stuttgart, where Moreau attempts to steal the Baron’s most prized possession – a lost masterpiece by Cranach the Elder, the final piece needed to complete a clandestine collection for a powerful, unnamed client. Lannert and Bootz, having uncovered Moreau’s true identity as the daughter of a notorious Nazi art thief, engage in a thrilling cat-and-mouse chase throughout the museum’s hallowed halls.

In a final, breathtaking confrontation, Lannert apprehends Moreau, recovering the Cranach and dismantling Der Schwarze Engel. However, the identity of their ultimate client remains a mystery – a chilling implication that the organization’s reach extends far beyond the art world, leaving a lingering sense of unease and the promise of future investigations. The black feather, a symbol of death and deception, serves as a grim reminder of the hidden shadows lurking beneath the surface of even the most polished facades. The case, while closed, leaves a bitter taste, reminding Lannert and Bootz of the enduring power of greed and the lengths people will go to possess beauty – even at the cost of a life.