A widowed country mouse is doing her best to prepare for the task of raising her orphaned grandchildren, Gregory and Grace, who have had to leave behind the only life they have ever known in the city.

After Cousin Buford picks up Gregory and Grace from the train station, Grandma Gray Mouse welcomes them with open arms. Equipped only with her unwavering love, she hopes it is enough to face the challenge she has been given. As Grandma Gray Mouse prays with all her heart that she has the strength to raise her grandbabies to be strong and happy, she teaches them valuable life skills as each deal with their enormous loss in different ways.

Nonny's Story of Love guides children to prioritize what is most important in life through the touching tale of a family of gray mice who must learn to navigate through love and loss together.