Torch

She pulled out her laptop and opened the anonymous e-mail.  The letters were in a different order, but they were the same.  I-C-H-B-U-N-R-T-E-B-T-H.  Once she separated the word 'THE', it was easy.  Burn the Bitch.

The person sending the e-mails was the person writing the letters.

When a young homeless girl dies in the latest of a string of arson attacks, Dr Rhona MacLeod is called in.  But here in Edinburgh she is off her patch - the Chief Fire Investigator is hot-tempered misogynist Severino Macrae, and he doesn't like to lose face.  As the attacks escalate, will their growing chemistry distract them from the murderous arsonist who seems to be infiltrating their personal lives as well as their work?