Poisoned, imprisoned and gagged

Joe and Frank left the cruise liner anticipating a pleasant lunch in St Petersburg. Others joined them. If lunch was pleasant, the after effects weren't. Food poisoning hit the twins. The crew's recommended restaurant was a mistake. So was complaining to the crew!

They were immediately confined to cabin, only bread and water to eat and no more trips ashore.

Frank, naughtier of the retirees, snuck off unobserved on one of the trips. Law-abiding Joe stayed aboard with starvation rations. Missed out on Helsinki and Stockholm. Scand...alous!

"Don't talk to anyone; don't mention the hush money!"

It wasn't enough!