Willow Weeps

It was 1993 when Andy last saw his sister, Willow, one minute he was holding her hand, and the next she was gone.
Thirty years later, Andy has a family of his own, but he's never forgotten his little sister.
How could he?
Her disappearance destroyed his family and ended his childhood, and with all the leads dried up and no new clues he's had to accept that she's gone forever. That's until he's contacted by a woman who claims to have a message for him from Willow, sceptical, but unable to resist trying anything Andy meets up with her.
Cleo knows things that were never made public at the time, and Andy starts to think that just maybe, she really is in contact with Willow.
When one of his childhood adversaries is found murdered Andy turns to the police officer in charge of the investigation at the time for help.
DCI Unwin Phelps had reluctantly retired with Willow being his only cold, unsolved case. Offered the opportunity to finally find out what happened to her he agrees to get involved. Working with Cleo and Andy they don't realise the danger they're in.
Is Willow back and seeking revenge?
If so, is she dead or alive, and why are those involved in the case being picked off, one by one?
Andy has to dig deep into a dark past he'd rather forget for the answers.