When Hugo McCreadie steps into Isla Brodie's pet portrait studio to get a "Festive Furball Photo Shoot" for his sister's cat Schubert, he does question his sanity. But he knows the photographs will be the perfect Christmas present for his eccentric sister, Nessa – and he finds himself quite taken with ditzy, animal-loving Isla Brodie, too. Will a Christmas secret from long ago prevent Hugo and Isla's new friendship from going any further? Or will a certain big, black cat taking matters into his own paws lead them not only on a mad winter dash through snowy Edinburgh – but into each other's arms for Christmas as well?