Maeve's Child [short]

Last Sunrise [short]

The Looking Glass [short]

The Devils's Shadow [novel, complete]

From One Beast to Another [short]

From Limbo Straight to Seventh Street [short]

The Necrophiliac [novel, in-progress]*

The Empty World [novel, in-progress]*

Black Friday [Short]

The Deflowering of the Strange Orchid [short]

The Freak Show [not currently on Wattpad]

The Red Angel [novel, in-progress]

Treasure [novella, complete]

Vampyre [not currently on Wattpad]

Trepidation [novel, *near* complete]

An Introduction to Trepidation [short]

Indulgent Filth [novella, in-progress]

Saints of Evil [novel, complete]

Serpents in Eden [novel, complete]

Invasive Species [short]

Raziel and Israfel [novella, complete]

Revelation [not currently on Wattpad]

So Dies the Sun [not currently on Wattpad]

Some notes:

The shorts can each be read as stand-alone stories.

The short stories From One Beast to Another, The Looking Glass, and From Limbo Straight to Seventh Street all take place during the time period covered by both The Devil's Shadow and The Empty World (novel). I recommend the order above to avoid most potential spoilers.

The Empty World (novel) completely overlaps the timelines of both The Devil's Shadow and The Necrophiliac, yet both fills-in and continues from where those stories leave off. 

*Some events run parallel in The Necrophiliac and The Empty World (novel), as told through Amadeo's POV from one city and Morpheus's POVs from another city, respectively. If The Necrophiliac is read first, it gives some spoilers for relationships developed in The Empty World and the reader will have some foreknowledge of events. If The Empty World is read first, then it spoils the cause behind a mystery in The Necrophiliac and the reader will have a lot of foreknowledge of what will happen.  

One doesn't have to read the earlier novels to understand The Trepidation Trilogy (Trepidation, Saints of Evil, and Serpents in Eden).

The short story Introduction to Trepidation actually takes place between the prologue and first chapter of Saints of Evil.

The novellas (Treasure, Indulgent Filth, and Raziel and Israfel) can pretty safely be read at any point after The Empty World (novel)

Indulgent Filth and Saints of Evil overlap timelines.