Remarkably Bright Creatures by Shelby Van Pelt was a lovely read.
Tova, who had lost both her husband and son, works at night cleaning a local oceanside aquarium. In her 70s she enjoys meeting with friends once a week in their group called the Knit-Wits. Most of their meetings involve drinking tea, gossiping and supporting each other but when she becomes "friends" with a giant Pacific octopus, that frequently escapes his tank, she doesn't share the event with her friends even when they notice sucker shaped bruises on her arm where the octopus had "hugged" her.
After her brother dies, Tova starts to re-evaluate where she wants to spend her remaining life but she still has a nagging need to know what really happened to her eighteen year old son, lost at sea.