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" But if Johnny Depp's mesmerizing performance — a bracing return to form for the star after a series of critical and commercial misfires — is the chief selling point of "Black Mass," there is much else to recommend this sober, sprawling, deeply engrossing evocation of Bulger's South Boston fiefdom and his complex relationship with the FBI agent John Connolly, played with equally impressive skill by Joel Edgerton"