(Season 45 | Episode 27) 44:20 minutes

The inside story of the Boston Marathon bombing investigation: Scott Pelley interviews Boston Police Commissioner Ed Davis. Also, Lara Logan gets a rare look into the secretive world of working dogs -- some of whose capabilities are military secrets -- and their handlers; And, Lesley Stahl gets the first in-depth look at the National September 11 Memorial Museum currently under construction seven stories below ground at ground zero.

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