There are 3 books in the The Malykant Mysteries series. The newest book is Death's Executioner which came out in 2019.

1
Death's Detective

Book cover of Death's Detective
To catch a killer, send a monster.

There's a realm. Wreathed in ice and snow, drowning in the dark, Assevan needs a different kind of hero.

There's a god. Merciless and cold, and quick to anger, the Lord of the Dead insists upon one thing only: vengeance for a murdered…
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2
Death's Avenger

Book cover of Death's Avenger
To catch a killer, send a monster...
But what if a monster isn’t enough?
Shadows gather, winter deepens, and Assevan falls farther into the dark.
Pitted against monsters and men, Konrad faces deeper challenges. Darker foes.
Some can rival even the Malykant’s power.
Pushed beyond his endurance, challenged beyond his…

3
Death's Executioner

Book cover of Death's Executioner
To catch a monster, send a killer.
Murderers and monsters alike stalk the snow-drowned streets of Ekamet.
When nightmares creep out of the dark, distant past, who can face them?
It will take the eldritch powers of the spirit-witch. The ruthless cruelty of the undead. And the monstrous implacability of…