Astrid has been living with the guilt of her sister's death for many years as she was supposed to be babysitting her, but Nina had trouble not running off. Now she's back in Heron Bay as her aunt Maude has found a letter that may change everything but when Astrid arrives, Maude seems to have been attacked.

Now that she's back, there are clues that what she thought had happened to her sister may be wrong and she may have been murdered. There are some more cryptic letters found and Astrid as a forensic document examiner (especially how people write) tries to figure out their mysteries. 

This was a fast book and can be read in a day if you concentrate. I unfortunately started it when I started to move houses so it took me longer 😞
But there were enough twists to keep me engaged at the times that I really was able to read a bunch in one session.