Private Berlin is a thriller novel by James Patterson and Mark T. Sullivan, part of the Private series, focusing on the Berlin branch of the Private investigation firm. The plot centers on the disappearance of star agent Chris Schneider, leading his ex-girlfriend and fellow agent Mattie Engel to investigate his final cases, which involve a billionaire, a soccer star, and a nightclub owner with mob ties, uncovering dark secrets and a dangerous killer. 
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