Agatha Raisin and the Murderous Marriage (Agatha Raisin, #5)

In her fifth outing, pushy and endearing Agatha Raisin has wedding to Cotswold neighbor James Lacey interrupted by her first husband, not divorced, thought-dead, Jimmy Raisin. Matters go quickly from bad to worse. Jimmy is found murdered; Agatha and James are the prime suspects.