In The Adventures of Rembrandt the Tuxedo Cat: Surprises Miss Lady on her Milestone Birthday, Remy decides he wants to surprise Miss Lady, a cantankerous Tortoiseshell Cat, for her milestone birthday with a huge party. Remy asks Sophie if she could help him plan the birthday party surprise. The funny thing is everyone thinks Miss Lady does not like surprises, she doesn't like crowds, and she doesn't really want to be celebrating her age, but is that really true?

Can Remy, along with friends and family, get Miss Lady to the birthday party? Will Miss Lady be able to handle all the animals who want to wish her well? This is the fifth book in The Adventures of Rembrandt the Tuxedo Cat series.