The verses of the Torah suggest that Joshua wrote part of the Torah - which might just be the passages about the city of refuge (since he later implemented the plan for them, upon entering the land). Or did Joshua simply repeat it later in his own book? A worthy dispute. Also, a new mishnah: The role of the kohen gadol and his death with regard to exiles returning from the city of refuge. Plus, the role of the anointed kohen. Plus, how the mothers of the kohanim gedolim helped the exiles, so they wouldn't pray for the deaths of the mothers' sons (though those prayers might not bring about his death either!). Plus, a real case of defamation and lashes. Also, a mishnah about the timing when the exile verdict comes down - depending on the life of the kohen gadol, and what happens if that seat is empty.