Little Lou adores her grandfather, who’s known and loved her since the day she was born. But he’s dealing with dementia; some days, he can’t remember the ends to the stories he started, “as if the vast deep sea has swallowed” his memories up. Lou finds ways to help trigger his recollections, but these don’t always work; she learns that patience and understanding are a part of loving someone who’s going through challenging times. In this tender, empathetic picture book, the textured illustrations pair pops of color with fuzzy elements evocative of fingerprint smudges and sponged ink to magnetic effect.