The Mentalist has been off air for a long time (nearly two months). The show returns tonight after the big hiatus with the new episode titled Black Helicopters. Here's what to expect:

The show's first episode back finds Jane literally going underground to work a case. According to a sneak peek of the episode, the plot centers around the death of a US attorney in Mexico, which leads Jane to a separatist compound near the border, reports Zap2it.

"Jane (Simon Baker) calls Fischer (Emily Swallow) and Cho (Tim Kang) and asks them to trace his phone, but when they arrive, there's no sign of him -- just an angry guy with a shotgun," states the report.

The situation seems a bit 'in-control' when Jane, through Fischer's phone, asks everyone not to shoot and then pops out of a hole in the ground.

Rigsby and Van Pelt will also feature in the story, which involves a plot against multiple members of the CBI.

Watch the promo below:

The Mentalist airs at 10 pm ET/PT Sunday on CBS.