Literary Mystery

Copley
O'Neal

Character-driven novels set within the long light of the California coast. Stories of place, and what we keep hidden from that very light.

Novel Forthcoming  ·  A Death on Halconido
Portrait of author Copley O'Neal

About

A few words
about the work.

Copley O'Neal writes literary mystery novels in the tradition of P.D. James, Ruth Rendell, and Tana French, fiction that highlights character and the slow gathering of truth. A Death on Halconido follows Luiseño Detective Will Aguayo as he works a case on the San Diego mountain above his valley home, hunting for leads into the death of talented ornithologist Dr. Brandt Holme. But, as Aguayo soon finds out, the mountain community of Halconido has no intention of giving up its secrets that easily.

Another novel, The Garden Fair, is in progress. She lives near the Pacific and writes before sunset.

"Motive may not be necessary to prove in a court of law, but it is the hardened axis on which every good mystery spins." — On A Death on Halconido

Books

The work, so far.

Cover of A Death on Halconido by Copley O'Neal — an art-nouveau-style illustration of pines, water, and mountains framed in gold on dark cloth.
Forthcoming · Novel

A Death on Halconido

A Novel

Brandt Holme was a brilliant ornithologist — meticulous, exacting, and not especially loved. When Dr. Holme is found dead on his Halconido property, Detective Will Aguayo suspects murder. But every lead fragments into more questions. The family is challenging. The neighbors are hostile. The environmental activists are hiding something. And the evidence doesn't behave the way evidence should.

Aguayo is Luiseño, raised in the valley below this mountain, now sleeping in a rebuilt ancestral shelter as he works the case. The land speaks to him in ways he's only beginning to understand. But understanding won't be enough. To catch this killer, he'll have to see past decades of buried resentment — and recognize a kind of brilliance no one thought to look for.

Buy the Book
Cover of Dark Klei by Copley O'Neal
Enhanced Edition · Apple Books

Dark Klei

A Novel

“Ten years is a long time to sit on a story.”

Boston Globe reporter Elspeth Moore is assigned to write about Siobhan Sweeney, a sixteen-year-old Charlestown girl who vanished during a 1975 anti-busing protest. Siobhan was the daughter of an Irish Catholic activist and a mother whose girlhood vision in a coastal Irish village had set the family’s course decades before Siobhan was born.

The case opens with an anonymous letter in Gaelic and widens from there: gunrunners and forced desegregation, a young Black man named Titus Heaps who loved Siobhan, a mother who believed she was serving God, and a transformation Elspeth struggles to render in print.

A literary mystery in the lineage of Dennis Lehane and Tana French, a modern-day Joan of Arc tale set in Boston during a time of upheaval.

This enhanced edition includes photographs and video clips integrated into the narrative — designed for Apple Books.

News & Events

Where I'll be,
what's happening.

  • Jul 17–19, 2026
    Book Passage Mystery Writers Conference Corte Madera, California
    A weekend among friends and editors at one of the warmest gatherings on the calendar.
  • Aug 10, 2026
    A Death on Halconido — pub date Available in hardcover, softcover, and ebook
    Publication day. Pre-orders ship beginning the prior week. A signed first-edition tip-in is available through participating independent bookstores.
  • Apr 1–4, 2027
    Left Coast Crime Santa Fe, New Mexico
    A first trip to Santa Fe for the annual gathering.

A Side Door

Ask the Detective.

Three questions only

Put a question to Detective Will Aguayo.

Will Aguayo, the sheriff turned detective from A Death on Halconido, will take three questions. Ask him about the mountain, his work, his abuelita, or whatever you're curious about. Because he is a professional, he likely won't discuss the specifics of any ongoing case. You'll need to read the book all the way through for that.

3 questions remaining

For the Birders

A field checklist.

Twenty-one species

Birds of Halconido.

Every bird that wings through A Death on Halconido, from the Acorn Woodpecker drilling its granary trees to Clark's Nutcracker caching pine seeds beneath the mountain snow, gathered into a vintage field-guide checklist. Print it, carry it into the oaks and chaparral, and mark off each species as you find it.

Indigo Bunting (Passerina cyanea), an illustrated plate from the Birds of Halconido field checklist
Open the checklist Printable PDF · 3 pages · US Letter

From Halconido Mountain

A postcard in the mail.

The back of a vintage postcard bearing a Halconido Mountain return address

Leave your address and one of Halconido Mountain’s residents — perhaps May Doddle of MayMart herself — will send you a handwritten postcard. A small thank-you for reading.

Contact

Get in touch.

For press, events, and reader correspondence.