Colorado double cross
(Book)

An undercover assignment turns into a dangerous mountain escape. Following the suspicious death of his partner, DEA agent Nick Anderson goes undercover to expose a drug cartel and a mole in his own agency. The last thing he expects is his late partner's widow, Alexis White, conducting her own secret investigation. Now his cover is blown and it's up to Nick to keep Alexis alive. But with killers on their heels, the search for answers could be his deadliest mission...