complice
He didn't have any accomplice.
Il n’avait aucun complice.
La nuit est ma complice.
The first one to look up from his plate is his accomplice.
Le premier à lever les yeux de son assiette est son complice.
— The Devil's Backbone (2001)
Où est ton complice ?
The criminal had an accomplice.
Le criminel avait un complice.