Spy Cases #10

Grant is in Tokyo when he finds enemy agents attacking Captain Dunsany. Grant saves Dunsany's life, but the next time they meet Dunsany doesn't recognize him; Grant realizes this Dunsany is an impostor and steals aboard Dunsany's plane where he learns the false Dunsany is the Tiger, a top Communist agent who intended to bomb a UN location with the US plane. The Tiger escapes into Korea but Grant pursues him and takes infra-red pictures of the Tiger's forces to embarrass them internationally.