Coral Airlines Mystery

Every trip is an adventure. But happily-married couple Toby and Birdie Parkinson get far more than they bargained for when they set out as passengers on a new airline. What is so mysterious about their fellow passengers? Why is one of them murdered in a sight-seeing excursion in Singapore? Who is running this airline and why is the route suddenly changed?Can they trust anybody on board?Little did they think when they left home that they would stumble into an international crime ring; or that their adventure would open up new friendships.