Death by Dumpster — Karen Hanson Stuyck

Laid off from her magazine job, Lauren Prescott reluctantly agrees to ghostwrite a memoir for Caroline Marshall, the self-described Queen of Dumpster Diving. Lauren attends a potluck dinner at Caroline's house, where guests bring food they found dumpster diving. By the end of the evening, one guest is dead, poisoned by toxic nuts. Days later another dinner guest dies after trying homemade goodies sent to Caroline by “A Grateful Former Student.” Lauren is determined to bring the murderer to justice. But first she has to save herself from a ruthless killer intent on adding her to the list of victims.
This fast-paced, humorous mystery will leave you guessing who-done-it until the very end. It is the second Lauren Prescott Mystery, following FIT TO DIE.