There are 10 books in the Whyborne & Griffin series. The newest book is Deosil which came out in 2019.

1
Widdershins

Book cover of Widdershins
A reclusive scholar. A private detective. And a book of spells that could destroy the world.Love is dangerous. Ever since the tragic death of the friend he adored, Percival Endicott Whyborne has ruthlessly suppressed any desire for another man. Instead, he spends his days studying dead languages at the museum

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2
Threshold

Book cover of Threshold
Introverted scholar Percival Endicott Whyborne wants nothing more than to live quietly with his lover, ex-Pinkerton detective Griffin Flaherty. Unfortunately, Whyborne’s railroad tycoon father has other ideas, namely hiring Griffin to investigate mysterious events at a coal mine. Whyborne, Griffin, and their friend Christine travel to Threshold Mountain, a place


3
Necropolis

Book cover of Necropolis
Introverted scholar Percival Endicott Whyborne has spent the last few months watching his lover, Griffin Flaherty, come to terms with the rejection of his adoptive family. So when an urgent telegram from Christine summons them to Egypt, Whyborne is reluctant to risk the fragile peace they’ve established. Until, that is,


4
Bloodline

Book cover of Bloodline
Between his bullying father and dissolute brother, Percival Endicott Whyborne has quite enough problematic family members to deal with. So when his sister returns to Widdershins asking for help solving the mystery of a derelict ship, Whyborne is reluctant to get involved. Until, that is, a brutal murderer strikes, leaving


5
Hoarfrost

Book cover of Hoarfrost
Sorcerer Percival Endicott Whyborne and his husband Griffin Flaherty have enjoyed an unprecedented stretch of peace and quiet. Unfortunately, the calm is shattered by the arrival of a package from Griffin’s brother Jack, who has uncovered a strange artifact while digging for gold in Alaska. The discovery of a previously


6
Maelstrom

Book cover of Maelstrom
Between his father’s sudden—and rather suspicious—generosity, and his own rash promise to help Christine plan her wedding, Percival Endicott Whyborne has quite enough to worry about. But when the donation of a mysterious codex to the Ladysmith Museum draws the attention of a murderous cult, Whyborne finds himself in a


7
Fallow

Book cover of Fallow
When Griffin’s past collides with his present, will it cost the lives of everyone he loves?Between the threat of a world-ending invasion from the Outside and unwelcome revelations about his own nature, Percival Endicott Whyborne is under a great deal of strain. His husband, Griffin Flaherty, wants to help—but how


8
Draakenwood

Book cover of Draakenwood
Someone is killing members of the old families
and the evidence points to Whyborne. Widdershins has been unusually quiet for months. But now a mysterious creature from the Outside is on the loose, assassinating members of the town’s old families by draining their blood. Whyborne and Griffin set out to solve


9
Balefire

Book cover of Balefire
Whyborne’s Endicott relatives have returned to collect on the promise he made to help them take back their ancestral manor from an evil cult. In exchange, they’ll give him the key to deciphering the Wisborg Codex, which Whyborne needs to learn how to stop the masters.

To that end, Whyborne,


10
Deosil

Book cover of Deosil

Whyborne, Griffin, and their friends have faced down cultists, monsters, and sorcerers. But their greatest challenge is now upon them.

On the return voyage from Balefire Manor, Whyborne receives the worst news possible: Widdershins has fallen before the onslaught of the Fideles and their servants. There's still time to stop