As a math savant uncooks the books for a new client, the Treasury Department closes in on his activities and the body count starts to rise.

When an old acquaintance is murdered, Wolff is compelled to solve the case. Realizing more extreme measures are necessary, Wolff recruits his estranged and highly lethal brother, Brax, to help. In partnership with Marybeth Medina, they uncover a deadly conspiracy, becoming targets of a ruthless network of killers who will stop at nothing to keep their secrets buried.

A pilot transports a U.S. Marshal accompanying a government witness to a trial in New York. As they cross the Alaskan wilderness, tensions soar and trust is tested, as not everyone on board is who they seem.