Champion of the mystery section in a Minnesota library, Karen Nash is embarking on a dream trip to London. But she is clueless why the love of her mid-life, Dave, would dump her hours before take-off, until she spies him at the airport with a young honey! She decides the best revenge is to get on that plane anyway and entertain schemes for Dave's untimely demise. After touching ground in the hallowed homeland of Christie, Sayers, and Peters, she checks into a cozy B and B run by charming bibliophile Caldwell Perkins. Soon she is spilling tears in her pint at the corner pub, sharing her heartbreak saga with a stranger. That night, a B and B guest drops out of circulation, permanently. Then Karen realizes Dave and his cutie are an assassin's target. With the meticulous attention to detail that makes her a killer librarian, Karen sleuths her way through her own real-life mystery in which library science meets the art of murder.