The below is a list of all novels or other writings co-written with other authors.

Winter Solstice Series

• Convergence
• Containment
• Catalyst
• Catacombs

Alexis Silver Series (VFH world)

• Silver Light
• Deep Silver
• Silver Quarrel
• Silver Crucible

Samantha Moon Vampire for Hire Series

• Moon Master
• Dead Moon
• Lost Moon
• Vampire Destiny
• Infinite Moon
• Vampire Empress

Samantha Moon Short Stories (VFH world)

• Banshee Moon
• Moon Monster
• Moon Ripper
• Witch Moon
• Moon Goddess
• Moon Blaze
• Golem Moon
• Moon Maidens

Samantha Moon Origins Series (VFH world)

• New Moon Rising
• Moon Mourning
• Haunted Moon

Maddy Wimsey Series

• The Devil’s Eye
• The Drifting Gloom
• Dark Mercy

Immortal Operative Series

• Broken Ice

Four Elements Series

• The Elementalist
• The Black Rose
• The Wakefield Curse

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• Operation: Chimera (with Tony Healey)
• The Dysfunctional Conspiracy (with Christopher Veltmann)