Frank intervenes when tensions rise between Mayor Chase (Dylan Walsh) and the fire commissioner of New York City (Mira Sorvino). Also, Erin is blindsided when Henry agrees to testify for the defense in a case she is prosecuting; Danny and Baez investigate when human remains are discovered in a storage unit; and Eddie and her partner Badillo navigate a complicated arrest when their criminal offender is scheduled to donate his kidney. (thetvdb.com)