Iris, a writer and educator, experiences upheaval in her peaceful, solitary life in New York when her dearest friend and mentor leaves her his cherished 150-pound Great Dane. The majestic but stubborn dog, Apollo, quickly causes practical issues for Iris, such as damaging furniture and leading to eviction threats, along with deeper existential challenges. However, as Iris unexpectedly forms a connection with Apollo, she starts to reconcile with her past and her own creative spirit in this tale of healing, love, and friendship.