Murder at the Foster Manor: Fiona Frost - Case File 206

Young Adult mystery series.
In the first suspenseful volume of the series, Fiona's criminal investigation skills are put to test as she's thrown on her first murder case in an old mansion that is rumored to be haunted. Fiona finds herself drawn deep inside of a dark world that causes her to question her desire to one day become the world's preeminent forensic investigator.