As a travel escort for seniors, Emily Andrew-Miceli has led her feisty Iowa clan all over the world. This time, they’re off to see historic windmills and Dutch art in Holland—if they can ever unplug from their smartphones, that is. Joining them is the class from Bangor, Maine, celebrating their 50th reunion, which is divided by old rivalries. Emily’s hopes for a 100% survival rate on this trip are dashed when an important member of the tour suffers a tragic (and highly suspicious) accident. Then the saucy seniors’ wild night of drug-laced desserts and risque shows in Amsterdam’s red light district gets even more mysterious when one reunioner—the class bully—goes...