From the publishers webpage:
Let the Right Ones Out
You build walls for two reasons: to keep things out, and to keep things in. Walls were erected around the Chicago Containment Zone many years ago, keeping people from the outside away from the dangers within, and locking secrets inside that are still waiting to be discovered. Though the longer they stay hidden, the clearer it is that some secrets don’t want to be found.
In the latest Shadowrun Mission, runners have a chance to solve one of the longest-standing mysteries of the Containment Zone, namely: What happened to Melissa Truman, the missing heir of a media empire? Digging up the right information will be hard enough, but if the runners are lucky and skilled enough to uncover the truth, they’ll have a harder question in front of them. What do they do with what they’ve found?
Full of danger, intrigue, and insidious obstacles, Tick Tock is a great continuation of the ongoing Chicago-based plotline for regular Missions players, or a fast-paced adventure for players jumping into the story for the first time.
SRM 06-04: Tick Tock is for use with Shadowrun, Fifth Edition.