Very Nice Funerals by Jennifer Crusie

Rose Malone is doing all right except that her daughter is struggling with PTSD, her lover is leaving her for the Appalachian Trail, and there’s a rumor that there’s a million bucks in the building she inherited which has inspired every money-hungry man in her weird little town to bring her cheap flowers and offer to search the place for her.
Max Reddy needs to get back to the Appalachian Trail; it’s hard to recover from a life of covert operations when you’re in a community of ex-agents. But that community also has a woman and her daughter he cares about more than he thought possible. If he hadn’t made it his mission to finish walking the Trail, he might stay, but he always finishes what he starts.
Then Max finds one of Rocky Start’s citizens dead in a coffin, and suddenly Max and Rose are after a killer in a town where a large percentage of the population is retired assassins. There’s the funeral director, the exterminator, the postmaster, the postmistress, the honey store owner, and the femme fatale, not to mention the handsome outsider journalist poking around for a story about serial killers.

And now the killer is aiming at new targets: Rose and Max.

Very Nice Funerals: Send flowers. Express your sympathy. Duck.