Book 16 in this new series sees the young inventor presented with a problem that may or may not happen in a locale so far away it could be meaningless.Or, it could turn deadly Haley's Comet is swinging back in for its next appearance, only this time it will pass very close to a newly identified planet far outside the orbit of Pluto. Eris is larger than Pluto and even possesses a small moon. So, with the possibility that Eris could influence Haley's...