Why a NY Times reporter held back a story on nurse kidnapped by ISIS

It's been over five years since the New York Times' Rukmini Callimachi learned that ISIS had abducted a New Zealand nurse named Louisa Akavi and two of her colleagues in Syria.

But Callimachi agreed not to tell Akavi's story — until now. 

On Sunday, the Red Cross made a public appeal for information that might help them find...