Adelle didn't expect her sixties to be... boring. So when her travel-agent friend asks her to guide a cruise from Budapest to Amsterdam, the born people-pleaser jumps at the chance to help four women have an unforgettable vacation. But when expensive jewelry goes missing, she fears one of her happy travelers could be the culprit. Struggling to contain an increasingly unruly group of guests, Adelle has her hands full while trying to solve the case. And with accusations flying and tempers rising fast, she's terrified she's sailing straight into a whirlpool of disaster. Will Adelle unmask the crook before her adventure sinks into muddy waters? Diamonds on the Danube is the enchanting first book in the River Cruise Cozies mystery series. If you like globe-trotting heroines, quirky casts, and spectacular settings, then you'll love Cheryl Dougan's glittering whodunit.