I Spy With My Little Eye

When what you don't know will kill you.
A dead Santa throws Marlow and Sage together in this Nursery Rhyme Suspense short story.
The target isn't Santa, it's Sage, and she and Marlow aren't the only ones who want information from the would-be assassin. Temporarily recruited by CISUE, Central Intelligence for Special or Unusual Events, Marlow and Sage are tasked with finding out the identity of CISUE's main nemesis, and while they're at it, smoke out the company mole.
Marlow and Sage surprise themselves by what appears to be a latent skill set, perfect for taking down bad guys. They'd pat each other on the back later if only they hadn't agreed to have their memories wiped.
Who are you again?