Nearly a decade after Ben Affleck introduced the world to Christian Wolff in 2016’s “The Accountant,” a sequel is born. Gavin O’Connor’s “The Accountant 2” continues a trend of long-awaited sequels picking at the carcasses of existing properties for any possible franchise potential.

Bill Dubuque’s screenplay is a trope-regurgitating mess — unremarkable, jump-around nonsense — but somehow stumbles into an entertaining brand of B-grade action silliness. The tone evolves from deadly serious to deadly kinda-sorta serious, alleviating a few of the original’s pain points. Don’t expect anything groundbreaking, just an entertaining take on neurodivergent mercenaries and brotherly love.

Affleck reprises his role as autistic badass Christian Wolff, aka “The Accountant,” whose books aren’t exactly clean. Treasury Agent Marybeth Medina (Cynthia Addai-Robinson) reluctantly contacts Christian after someone close to both takes a fatal bullet. They join forces with a shared taste for justice, but deciphering the tangled web of available clues requires help.