Zane and Finola are at a traditional country fête where the pair help with the preparation and serving of the meal which earns them praise. Soon Finola catches sight of someone dangerous and it's time for the twins to escape. But if they go, they won't get to join the treasure hunt, which they are convinced will lead them to Dad.

Mae Zane a Finola yn mynychu ffair wledig draddodiadol, gan dderbyn clod am helpu gyda pharatoi a gweini bwyd. Cyn hir, mae Finola yn gweld rhywun sy'n berygl iddynt, felly mae'r efeilliaid am ddianc. Ond os gadawant y ffair, fyddan nhw ddim yn medru ymuno yn yr helfa drysor, helfa y credant all eu harwain at eu tad.