How and why did Malaysian Airlines MH370 disappear ? A new book "The Disappearing Act" raises questions on the 7th anniversary of one of aviation's greatest mysteries.

How in this age of technological tracking could a Boeing 777 with 239 lives on board simply disappear off radars?Are there inconsistencies in the official narrative surrounding what happened to the the doomed plane? Michelle Martin speaks with author of " The Disappearing Act: The Impossible Case of MH370", Florence De Changy to find out. 

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