The Secret Hideout (Sugar Creek Gang Series) MMPB by Paul Hutchens

"Poetry" brings his muddy lamb into Miss Lilly's classroom, and chaos breaks out.  The gang later discovers a mysterious cave with a hidden passage near the cemetery.  When they spend the night in the cave, they are frightened by two very different visitors dressed in white.  Could they be ghosts?  Watch Poetry's pet lamb provide a helpful explanation of Jesus' parable of the lost sheep.