Karen's Mermaid is the 52nd book in the Baby-Sitters Little Sister series.
Back Cover SummaryEdit
Karen is so happy to be in Sea City! Margo Pike is there, too. But Margo is a bossy bragger. Margo brags so much that Karen brags back. She tells Margo she saw a mermaid in the ocean.
Then Karen receives a note from a mermaid. Neptuna wants to be Karen's mermaid friend!
Oooh. Has Karen's mermaid become real?