In 'Guardian Angel,' the sequel to 'BOONE', Boone reluctantly allows Marianne, his office assistant, to work with him on a fraud case that seems routine. Things go well, Marianne captures incriminating photographs of the target which wraps up the case. Her accomplishment however results in catastrophic consequences for her. While the effects of the fraud case have yet to unravel, a friendly confidential informant from Boone's days with the New York State Police turns to him for help after being fleeced by a crooked cop, one Antonio Caruso. The informant's body is discovered the following morning. As Boone begins to investigate, he finds himself being shadowed by Albany police tipped off by one of the city's gangs. After working on site at one of the office's clients, Marianne later finds herself charged with murder as a result. The evidence against her seems to be rock solid. Frustrated by the seeming intractability of both cases, Boone lashes out at Deborah, jeopardizing their flourishing romance. While defense attorney Clive Townsend tries to untangle the charges against Marianne, Boone struggles to find the link between both cases. Just as he seems to be able to fit all the pieces of the puzzle together, someone else has a very different plan, leading to explosive consequences for both Boone, and Marianne.