Christmas is coming for Katie Mouse and the rest of the Mouse family! On Christmas Eve, Santa Mouse and his mouse elves arrive to leave gifts for Katie and Dylan. But Alvar, the newest elf on the sleigh, wanders off to explore, and winds up meeting the Katie and her little brother, Dylan, face to face. Can Alvar help Katie discover her deepest Christmas wish? And can Katie help Alvar, when Santa Mouse accidentally leaves him behind? For ages 4 to 9.