A long weekend with lots of snow sounds like a recipe for super-special fun to Nina, especially with new friends Priya and Nayan visiting. They’ve just moved to Wisconsin from Florida, so Nina is prepared to introduce them to lots of winter activities: snowball fights, snow angels—and maybe even a snow fort!

And then Nina notices a strange car at her neighbors’ house while they’re out of town. Clearly, it’s time to be a Snow Spy and identify MP (Mystery Person).

I-den-ti-fy means to find out who the person, plant, animal, or thing really is.