The team joins forces with FBI Director Isler after a Russian operative with intelligence on sleeper agents disappears; Tammy partners with former sleeper agent Eva Azarova to assist in the disappearance.
Cassidy Freeman's character Eva Azarova, states she wants to wander the plains of Montana. Freeman's parents own a cattle ranch in Montana. Moreover, in Longmire (2012), she portrays a character who resides in a fictional county in Wyoming, a state just south of Montana.
In Intelligence circles, an asset is a "confidential informant", someone who provides information on an enemy intelligence agency or other organization.