The White Whale
| Episode Number | 21 |
|---|---|
| Season | 7 |
| Aired | 2019-05-15 |
| Overview | A serial arsonist cold case is reopened when Lt. Severide finds a connection to a recent salon fire. Firehouse 51 celebrates a retirement party. |
| Runtime | 41 minutes |
| Absolute Number | 158 |
| Finale Type |