The book of love

Laura, Daniel and Mo disappeared without trace a year ago. They have long been presumed dead. Which they were. But now they are not. And it is up to the resurrected teenagers to discover what happened to them. Revived by Mr Anabin — the man they knew as their high school music teacher — they are offered a chance to return to the mortal realm and solve the mystery of their death. But only two of them may stay.
What they do not realise is their return has upset a delicate balance that has held - just - for centuries.