The Orphanage by the Lake paperback book by Daniel Miller

Hazel wants a new life.  She's thirty years old, single, and her private investigation business is months away from folding.  Her luck takes a turn when Madeline Hemsley, a mysterious socialite, pays Hazel a visit with an offer too enticing to resist. An orphan girl has disappeared from a children's home―The Orphanage By The Lake, as the locals call it―and Madeline wants Hazel to find her.  At first glance, it appears to be a standard runaway case, but as Hazel plunges into the investigation, she finds signs of something more: unexplained blood stains, cryptic symbols, sinister figures shadowing her every move. The more she digs, the more she realizes that The Orphanage By The Lake holds terrifying secrets, and even worse…  …so does Madeline.