My Fatal Valentine by Leighann Dobbs

Juniper Holiday’s annual Valentines Day party is all about love and romance… and this year, it’s also about murder.

When the grand prize winner is found dead in the bathroom, there are very few clues as to who did it. With a house full of guests, there are plenty who had means and opportunity, but who had motive?
Detective Mallard is already in trouble with his boss, so he needs to solve this one fast… even if that means getting some help from the mansion ghosts.
And just when Juniper thinks she has it all figured out, she discovers that making the wrong assumptions can be deadly.