From The Trilogy: Moonight & Myrrh - The 13TH Moon - Book 1 - Drops Soon!

When a forbidden letter arrives on a fog-drenched day, Josephine Nyx a sharp-tongued private investigator and reluctant witch, finds herself dragged back into the family secrets she's spent her life avoiding. Her estranged grandmother warns her: the thirteenth moon is rising, and Josephine must choose between blood and oath.
Unfortunately, the only person who can help her is Rowan Rollins - the emotionally constipated PI with a black cloak and a betrayal she hasn’t forgiven. As she unravels the mystery behind the mushroom cult Velum Obscura, Josephine uncovers a curse that has haunted her family for generations - and a love that refuses to die.