Fire and hemlock

Polly has always loved the fire and hemlock photograph which hangs above her bed, with its suggestion of mysterious dark figures and undiscovered secrets. But now, it sparks memories in her that don't seem to exist any more. Memories of Thomas Lynn, who became her greatest friend... Memories of the stories they made up together - adventures in which Tom is a great hero and Polly is his assistant... Memories that these adventures had a nasty habit of coming true... What has happened in the years between? Why has Tom been erased from Polly's mind, and from the rest of the world as well? And why is Polly so sure that she must have done something dreadful? Determined to uncover the awful truth, she casts her mind back ten years to when it all started. At the funeral.