The team realizes they have a cross-country serial hugger on their hands, after another body is found bound with the same sophisticated knot as their local victim. Also, the case has ties to Isobel's father, Robert, and his hotel, leading to revelations about their fractured relationship.

FBI Season 4 Episodes...

• s04e01 - All That Glitters (1)
• s04e02 - Hacktivist
• s04e03 - Trauma
• s04e04 - Know Thyself
• s04e05 - Charlotte's Web
• s04e06 - Allegiance
• s04e07 - Gone Baby Gone
• s04e08 - Fire and Rain
• s04e09 - Unfinished Business
• s04e10 - Fostered
• s04e11 - Grief
• s04e12 - Under Pressure
• s04e13 - Pride and Prejudice
• s04e14 - Ambition
• s04e15 - Scar Tissue
• s04e16 - Protective Details
• s04e17 - One Night Stand
• s04e18 - Fear Nothing
• s04e19 - Face Off
• s04e20 - Ghost From the Past
• s04e21 - Kayla

FBI Show Summary

A fast-paced drama about the inner workings of the New York office of the Federal Bureau of Investigation. These first-class agents bring all their talents, intellect and technical expertise to tenaciously investigate cases of tremendous magnitude, including terrorism, organized crime and counter intelligence, in order to keep New York and the country safe.