Courtney Smyth: The Unsolvable Case [2026]

The witchy fantasy murder mystery series concludes in one last
mystery for Mallory, Cornelia and Diana, as they have to solve
their biggest, and most important case of all - who killed
Theodore. Perfect for fans of supernatural mysteries and cosy
crime by authors such as Ben Aaranovitch, Josiah Bancroft and
Tammie Painter.

It’s three days until Samhain, and the Undetectables are going to die.
No longer taking magical cases (not that anyone would hire them),
they’ve well and truly given up the ghost.
Meanwhile, Theodore (the relinquished ghost in question) is on the
run. Wanted in connection with the Undetectables’ last case, he’s
hiding in the last place anyone would think to look, keeping secrets
(badly) and forming unlikely alliances (slightly less badly).
When a copycat killer emerges and history appears to be repeating
itself, the Undetectables are called up for one last case. Mallory, Diana
and Cornelia find themselves in a final race against the clock – but this
time, the whole of Occulture is at stake.

Courtney Smyth (they/them) is a chronically ill writer of stories, both
long and short, from Dublin, currently living in the West of Ireland.
They have had a number of short stories published in Paper Lanterns
Literary Journal, and appeared in The Last Five Minutes of a Storm
anthology from Sans Press. They have been writing about ghosts,
demons and murders since they were ten and have no plans to stop.
They can be found yelling about books on Twitter and Instagram
@cswritesbooks

OTHER BOOKS BY THE AUTHOR
The Undetectables series - The Unfathomable Curse ISBN:
9781835412213
The Undetectables series - The Undead Complex ISBN:
9781803364803
The Undetectables series - The Undetectables ISBN: 9781803364780