A goblin in the Port Sarim jail has one, one is in a secret door in the dwarvern mine, and the last is in the evil wizards maze.
you get one from the guard in varrock castle at the top floor. you get the second one from the wizard in wizard tower in lumbridge. you get the last one from the drain and you need to go down to the sewers to get the key when it drops
Brandon Mull wrote Fablehaven: Keys to the Demon Prison.
three keys.. first key is from captain rovin who is found by climbing two sets of stairs in the north west corner of varrock castle with a bucket of water you will wash the second key down a drain in the north-east corner of the castle which leader to the sewers east way from the castle. the third key is from the wizard traiborn who is found on the second floor of the wizard tower near lumbridge.
The keys to the demon prison in Fablehaven are the Translocator and the Chronometer. The Translocator is used to enter and exit the prison, while the Chronometer controls how long the summoner can spend inside. Both keys are necessary to safely navigate the demon prison.
By planing and winning the Key Quest game
March 23rd. its out now
It is titled: Fablehaven: Keys to the Demon Prison
They are free tail keys
'The Keys to the Demon Prison' is the last Fablehaven book.
it is called Fablehaven: Keys to the Demon Prison
544 pages
After Fablehaven, Keys to the Demon Prison, there will not be another book in the series.