After years of pursuing Cullen Crisp, an infamous drug dealer, LAPD detective John Kimble arrests him for murder; a witness saw Crisp murder an informant after getting information regarding the whereabouts of his former wife, Rachel, who he claims stole millions of dollars from him before fleeing with his son, Cullen, Jr. Partnered with former teacher-turned-detective Phoebe O'Hara, Kimble goes undercover in Astoria, Oregon to find Rachel and offer her immunity in exchange for testifying against Crisp in court. O'Hara is tasked with finding Rachel through her son by acting as a substitute teacher in a kindergarten class at Astoria Elementary School. However, she is incapacitated by a severe stomach flu, so Kimble takes her place.