Shadow of Doubt - Adventures in Retirement, #4

This wasn't the vacation FBI agent Nathan Stokes planned. He and his girlfriend Margaret Dalton were supposed to be in the Bahamas where Nathan was going to propose. Instead, they're in Possum Bottom, Minnesota during a brutal cold snap to talk to her lawyer about an inheritance at the reservation - a lawyer whom they find dead, frozen to the pavement outside his office. Things get really complicated when another murder occurs on reservation property and Nathan's ex-lover is assigned to handle the case.
Then multiple wills are found and suddenly Margaret might be a suspect. In a final confrontation during a raging blizzard, Margaret is forced to defend her family and her lover against a murderer no one suspected. And that's when she and Nathan discover how strong their bond truly is - and how easily it might be severed.