Miss Hawthorne Sits for a Spell - Katherine Hayton - Bog

The ghost of a witch meets a witch of a ghost!
While attending an auction, ghost-seer Emily Curtis can't resist purchasing an old puzzle box. She gets more than she bargained for when she finds the ghost of a witch attached.
Miss Hawthorne died in an accident a year ago, so there's no murderer to catch. Instead, her sister's spirit must be released from the puzzle box, which the ghost caught her inside before she died. If she remains trapped at the one-year mark, she'll die.
If only the book containing the release spell hadn't gone missing, the task would be easy. But with numerous Pinetar residents vying for the same prize, it will take all of Emily's wits to find the book and recite the magic spell before time runs out.