This book is the followup to Luis Carlos Montalvan's bestseller, Until Tuesday. In that book Montalvan, a captain in the U.S. Army who served in Iraq, shared his struggles with PTSD and how Tuesday, a golden retriever, came into his life. Tuesday's Promise, continues the story of their amazing bond and how service dogs have helped veterans, soldiers and other individuals with disabililites. The two of them have traveled throughout the United States spreading their message. Tragically, just before this book went to press, Montalvan took his life. To hear this is a shock since in one of the book's chapters he reflected on Tuesday's aging and what that would mean for both of them. Luis wrote "most likely I will outlive Tuesday." He talked about the Rainbow Bridge, where pets wait for their owners to join them. This time it would be Luis waiting for Tuesday. In the next chapter, he tells the reader that the process of acquiring a new dog, Promise has been started. An afterword in the book lets readers know that Tuesday is living with the individual who trained him for Luis and who had also been training his new dog, Promise. A powerful read.