The Pet and the Pendulum by Gordon McAlpine

In this final adventure of the identical twin, great-great-grand nephews of Edgar Allan Poe, Edgar and Allan are up against their greatest challenge yet.  Their arch enemy, Professor Perry, has returned disguised as the ghost of Edgar Allan Poe.  He tricks the twins into believing that Poe was murdered and that they must expose his murderer in order to release his spirit to the great beyond. Meanwhile, the space ship that acts as their parent's tomb is hurtling toward Baltimore and the twins may be the only ones that have any chance of stopping it.  Can the twins foil Professor Perry's plan and stop the space ship disaster before it is too late? As always, the twins get help from some historic literary giants from the great beyond and from their preternaturally loyal and intelligent cat. This is the funny and exciting end to a cleverly written series.(208 p)