Bigfoot and Nessie are visiting Nessie's home, the underwater Loch Ness Castle, and Bigfoot couldn't be more excited! The castle is huge, lavish, and it seems like Nessie has everything she could possibly want. Only things are not exactly what they seem- Nessie can't get away from her "overbearing momager" and endless celebrity duties -- and to make matters worse, there's a ghost roaming around in the house. Can Bigfoot and Nessie confront the ghost, stand up to Nessie's mom, and uncover the castle's haunting secrets?