The Castle Mystery (Jenny Starling Mystery #4)

Please note this book was first published as 'AN INVISIBLE MURDER' under Faith Martin’s pen name JOYCE CATO. Jenny Starling has her dream job cooking for Lord and Lady Avonsleigh in a genuine castle. Then one of the castle’s treasures, a fabulously jewelled dagger, is used to murder a staff member. The victim is found stabbed through the heart in the conservatory. Lady Avonsleigh insists that Jenny help the police find the murderer. But how can Jenny solve this case when the murder was committed in front of several reliable witnesses, none of whom saw a thing?