Day 25 The Undetectables

 Another day of The Undetectables draws to a close, with the conclusion set to arrive tomorrow. Theo’s arrest is resolved early on, as proof of his innocence is finally uncovered. But just as relief begins to settle in, the narrative takes a dark and devastating turn—Theo becomes the latest victim of “The Whistler.” His sudden death leaves all three girls shaken to their core.

We also learn more about the mythos surrounding the Ternion and its creation. It’s revealed that seven souls were required to bring forth the three goddesses. With Theo gone, four souls have now been taken—meaning one, or all three of the girls, could be next.

Theo’s death hit harder than expected. While he could often be frustrating, he was ultimately a loyal and caring presence—someone who loved The Undetectables like family. He was their emotional buffer, especially for Mallory, who often vented to him in moments of distress. His calming, if exasperated, presence brought much-needed levity, especially as the story grew darker.

And because Theo was already dead—a ghost—no one thought he could be killed again. It was reminiscent of that moment in Harry Potter and the Chamber of Secrets when Harry notes that Nearly Headless Nick couldn't be killed like the living students, because he’s already passed on. That same logic applied here—right up until it didn’t. Even the girls didn’t see it coming.

Theo may have often felt like a lingering houseguest, but he was the comic relief of the group—the heart, in many ways. Whether he was offering his “two sets” of ears to Cornelia and Diana after a murder, or hugging Cornelia and volunteering to accompany her to give a police statement following Becket’s death, he showed up for them, time and time again.

It feels like a loss—to the characters, and to the story. But there are hints that his departure may not be permanent. That offers a flicker of hope.

Shortly after, Cornelia vanishes. It’s assumed she’s gone to visit Becket’s grave. But as Mallory and Diana race to piece together what they’ve learned—particularly about how The Whistler kills—they make a shocking discovery. Evidence now points to the Night Mayor, Van Doran, as the possible culprit.

Unfortunately, by the time they reach him, he’s already dead.

This changes everything. It means the real Whistler is someone they never even considered—someone who’s evaded suspicion until now.

The twist is a smart one. The idea that the girls may be the final three souls to fulfill the Ternion’s summoning has been building steadily, and this final redirection doesn’t feel out of left field—it feels earned. That said, most mysteries at this stage would already have their culprit narrowed down. The Undetectables keeps its cards close to the chest, and with the end fast approaching, I’m genuinely eager to see how it all resolves.