This week's podcast is a conversation with Aaron Y. Zelin who discusses his new book, Your Sons Are at Your Service: Tunisia's Missionaries of Jihad.

In the book, Zelin explains how Tunisia became one of the largest sources of foreign fighters for the Islamic State— even though the country stands out as a democratic bright spot of the Arab uprisings and despite the fact that it had very little history of terrorist violence within its borders prior to 2011.

Zelin is the Richard Borow Fellow at the Washington Institute for Near East Policy and a visiting research scholar in the Department of Politics at Brandeis University. He is the founder of the website Jihadology.net, a primary source archive of global jihadi materials.

Music for this season's podcast was created by Feras Arrabi. You can find more of his work on his Facebook (https://www.facebook.com/ferasarrabimusic)and Instagram (https://www.instagram.com/feras.arrabi/)page.