Doc Savage (Dynamite Entertainment) #7 (2014)

Book 7
When his adventures began in 1933, Doc Savage was aided by five loyal associates. By 2014, his operation is truly global in reach, thanks to a smart phone of Doc's own design that allows anyone anywhere to ask for help or help others in return, and millions of people take part every day. But when everyone using the device is suddenly and without warning becomes immediately violent and aggressive, Doc might only have himself to blame
Release Date: 2014