- Prey
- Sphere
- Black Rose
- The Great Train Robbery
- Blue Dahlia
- Carnal Innocence
- Dance Upon the Air
- High Noon
- Lawless
- Sacred Sins
- Tribute
- Face the Fire
- Holding the Dream
- A Man for Amanda
- All the Possibilities
- Next
- Prey
- Sphere
- Black Rose
- The Great Train Robbery
- Blue Dahlia
- Carnal Innocence
- Dance Upon the Air
- High Noon
- Lawless
- Sacred Sins
- Tribute
- Face the Fire
- Holding the Dream
- A Man for Amanda

Sandstorm (Sigma Force #1)
An inexplicable explosion rocks the antiquities collection of a London museum, setting off alarms in clandestine organizations around the world. And now the search for answers is leading Lady Kara Kensington; her friend Safia al-Maaz, the gallery's brilliant and beautiful curator; and their guide, the international adventurer Omaha Dunn, into a world they never dreamed existed: a lost city buried beneath the Arabian desert. But others are being drawn there as well, some with dark and sinister purposes. And the many perils of a death-defying trek deep into the savage heart of the Arabian Peninsula pale before the nightmare waiting to be unearthed at journey's end: an ageless and awesome power that could create a utopia... or destroy everything humankind has built over countless millennia.
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Chapters
- The Loners
- The Saints
- Switched
- Fangtastic!
- Re-Vamped!
- Vampalicious!
- Tome of the Undergates
- Black Halo
- The Skybound Sea
- If You Stay
- If You Leave
- Until We Burn
- Before We Fall
- Every Last Kiss
- Fated
- Suspiciously Obedient
- Random Acts of Crazy
- Random Acts of Trust
- Her First Billionaire
- Her Second Billionaire
- Her Two Billionaires
- Her Two Billionaires and a Baby
- His Majesty's Dragon
- Throne of Jade
- Black Powder War
- Victory of Eagles
- Tongues of Serpents
- Empire of Ivory
- Crucible of Gold
- Delirium