On a special day for the Mularkey family, Tully reflects on decades of work, love, grief and joy alongside her best friend. Kate faces the unknown.

The team must deal with a mass casualty event that forces them to put aside their emotions following a recent tragedy.

When the hospital is hit with a cyberattack threatening to shut down life-saving machines, Lea rises to the challenge and looks to outsmart the hackers to prove herself. Meanwhile, the…