A rift in the powerful Sinaloa Cartel brings bloody war to the streets of Mexico - sucking the financial resources of the rival sides.

Now, a crackdown by the US and Mexico on fentanyl trafficking has depleted their millions even further, spurring Joaquín 'El Chapo' Guzmán’s sons to make a desperate alliance that threatens to transform the criminal underworld across the globe.

Nicola speaks with New York Times journalist Alan Feuer about Sinaloa, a fight for supremacy, and the ripple effects right to our shores.

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