Was The Monster of Florence acting on orders of a cult or a Sardinian crime family? Could he also be the elusive American Zodiac Killer?

Three girls named Pia disappeared from the same area, three years apart. The cases were eerily similar – was it only coincidence, or was it all part of a bigger plan?

One Sunday night Alistair Wilson was reading to his sons when an unknown man rang the doorbell. Moments later, Alistair was no longer alive.

In December 1900, a relief boat arrived at Lighthouse in the Flannan Isles, but no one was there. All three keepers had disappeared into thin air.