The Secret of the Lantern Keepers by Jenni Keer
**Intact Gift Giving Condition book**
Several weeks before her arrival, her beloved father stipulates in his will that his reclusive but strangely-gifted daughters must live apart from each other for a whole year in order to retain their family home. When Edith Averly is sent to investigate a murder at Green Briar Lunatic Asylum, a rambling gothic institution on the edge of the Cornish moors, she's horrified to realise that in order to infiltrate the asylum, she'll have to pretend to be mad herself... As a further condition of their inheritance, he assigns them each a crime that he was unable to solve during his recent years of armchair detecting. The eldest sister, Edith, can see echoes of violent events from the past.