The Thea Sisters are five students at Mouseford Academy on Whale Island. They are adventurous, lively, fun mice and they want to become journalists someday. Between lessons and friendship, life at Mouseford Academy is incredibly fabumouse! The most famouse band on Mouse Island — the Ratstreet Boys — is performing at Mouseford Academy! The band’s producer Mark Mousington is an old friend of Professor Anna Aria and he’s auditioning student bands as the opening act. Can the Thea Sisters win the spot as the opening band and reunite their professor with her friend?