The Time Detectives — Terry Deary

The Princes in Terror Tower: What really happened to the princes in the tower - the two youngest sons of Edward IV? They disappeared into the Tower of London and were never seen again... but there are clues to their fate. The Time Detectives set out to piece all the evidence together, but it nearly costs them their lives... King Arthur’s Bones: The brilliant and handsome King Arthur has become a legendary figure - but did he really exist? When the Time Detectives star in a school performance of King Arthur and his Round Table, they have a terrifying ghostly visitor. Could this really be King Arthur himself?