# The Message in the Hollow Oak

> 1935 novel by Carolyn Keene

**Wikidata**: [Q7751136](https://www.wikidata.org/wiki/Q7751136)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/The_Message_in_the_Hollow_Oak)  
**Source**: https://4ort.xyz/entity/the-message-in-the-hollow-oak