Shadow Lillies by Lee Ann Ward
Sixteen year old Julia Reynolds struggles with her parents gypsy lifestyle, and the urgent need to find out what happened to her missing cousin, Aubree. Soon, Julia stumbles upon the mystery surrounding the Ursuline Convent in New Orleans, it's banned third floor, and the blessed nails that seal it windows shut.
Solving the mystery of the Ursuline and blogging the story to the entire free world could gain more interest in the disappearance of Aubree. But, there's just one catch: the others who have explored this mystery have one thing in common....they're all dead.
Things get even more complicated when Julia falls for Ryan Crandle, the hottest guy in her school, and he falls right back. Will she really risk her life and new love to explore an unsolved mystery for the story that could save her cousin? Turns out, staring death straight in the face is just the beginning.