Ta rang Lísín ar bis a siad chun cuairta thabhairt ar an Musaem. Ta dineasar ann ata in ann bogadh! Ceapann Eoin Searlus gur dineasar ceart atá ann, ach deir Múinteoir Saili nach ga bheith
buartha. Ach tar eis tamaillin sa Mhusaem, ta gach duine an-bhuartha ar fad! An mbeidh Lisin in ann na paisti deasa a thabhairt slan?

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Lisin's posh classmates are beside themselves with excitement.They are going on a school trip to the Museum, to see a life-size moving dinosaur! But when Lisin's pet rat Gunther causes big problems, the museum trip takes an unexpected and very scary turn for the worse.