I love when the actor who plays the companion gets to write a story, because they know the character so well and this is super evident in this story. Louise writes, and acts this to perfection with Tom Baker on fine form. The villain of the story is SO irritating, a testament to the writing and performance because I just wanted to punch him myself. I think if this was a 3 parter it could've been even stronger, but it flew by despite being a 4 parter. One of the stronger entries in this range!