Night Huntress ★★★★☆

• Halfway to the Grave
• One Foot in the Grave
• At Grave's End
• Destined for an Early Grave
• This Side of the Grave
• ✔ One Grave at a Time
• ✔ Up From the Grave

Night Prince

• Once Burned
• Twice Tempted
• Bound by Flames

Spin Offs

• Eternal Kiss of Darkness
• First Frop of Crimson

http://jeanienefrost.com/reading-order/