Murder on Mars by M. M. Shelley
A paranormal force has lured Ava to New Orleans, where shadows lurk behind every corner and an unknown power has yet to be unleashed. There is a darkness in New Orleans, one that has brought sixteen year old Ava Lopez to the city in search of her best friend, Dyson. A dark crime has been committed, and there are supernatural forces involved. Three sisters who whisper "fate" are awaiting the arrival of the Guardian. Shadow People fiercely haunt the city, unchallenged, but Ava senses that Dyson may be involved with their crimes. She must discover the secret that the Shadows are so determined to keep hidden. Ava will have to risk everything, because where the Fates are concerned there are no second chances.
Also, check out this awesome giveaway for a $50 Amazon Gift card, here.