Dead Pan, the second title in the Daphne Martin series by Gayle Trent, is free in the Kindle store, courtesy of publisher Bell Bridge Books. Check your libraries for the first in the series,
Murder Takes The Cake, as an older edition was free (2009) and now has been replaced by an edition with a nicer cover (it's also KLL eligible, so Prime members can read it for free, anyway).
Book Description
Cake decorator Daphne Martin once again finds herself and her cakes at the center of a murder mystery. Half the town gets sick following a cake event, but for poor Fred Duncan, a bout with potential food poisoning quickly turns fatal. Now it's up to Daphne to sort through the likely suspects and figure out who frosted Fred.