The basis for the James Cameron movie version. The back:
"THE BIGGEST, GRANDEST SHIP IN THE WORLD -- AND IT'S UNSINKABLE! Indy's impressed. The Titanic, a fabulous new ocean liner, has everything -- swimming pools, Turkish baths, French cafes. Everything, that is, but enough lifeboats for all the passengers.
"Indy's got his hands full. First, he has to keep an eye on his former tutor, Miss Seymour. She's inheritied a fortune and Indy suspects the retireed colonel who's courting her is a shark. Indy's also promised to help hide a beautiful Irish stowaway. But what's worse, he's heard a mysterious conversation in German about blowing up the ship."
"Luckily, there's a man of authority on board Indy can trust. Or can he?"
... OR CAN HE? Ride to find out.
The story of Indy on board the Titanic. It seemed a little far fetched but enjoyable.