This is the second book in the Stoner McTavnish series and, like the first, it's a fun read. Many of the characters from the first book are back along with some new ones. In this story, Stoner is convinced to investigate the disappearance of the sister of her Aunt's friend. In the process she spends some time in a psychiatric hospital where the something shady referred to in the title seems to be happening.
This book, unlike the first book, is a bit more overt in it's supernatural elements though it's not really a big plot element. Stoner's neurotic behavior may have met it's match in one of the patients she befriends. Hopefully she'll learn to chill out a bit in later books, but I suspect not; that seems to be an essential part of Stoner's character.
The relationships between Stoner and the other characters are what really make these books work. The mystery element of the story is fairly straightforward and won't really keep you guessing but caring about the characters and what happens to them do keep the pages turning.