An investor in AmerisourceBergen Corp. is taking aim at the directors of the Chesterbrook-based drug wholesaler with a books-and-records suit in Delaware seeking to investigate potential wrongdoing associated with the opioid crisis.

The Chancery Court lawsuit, filed Thursday, said there was a “credible basis” to believe that AmerisourceBergen’s brass breached their fiduciary duties and helped to fuel an epidemic of addiction by failing to properly control distribution and report suspicious sales of the drugs.