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...