This case involves plaintiffs who sought to recover damages allegedly caused by a correspondent bank’s failure to act in response to a multi-billion dollar fraud. Its customer, an international banking company, sold certificates of deposit to individuals. Funds were illegally diverted and used to fund the lifestyles of top executives. It was alleged that the correspondent bank did not conduct appropriate anti-money laundering due diligence for nearly 10 years. An expert in correspondent banking was sought to opine on the standards of a reasonable bank, namely the circumstances in which due diligence would be applied.