...ish is a Big Finish Productions audio drama based on the long-running British science fiction television series Doctor Who.

The Sixth Doctor and Peri attend a conference of lexicographers at a college where an unfortunate murder has occurred.

The victim was a perfectionist linguist compiling the galaxy's biggest dictionary, and also a personal friend of The Doctor, but the only suspect is her holographic assistant, named Book, who is also a repository for every word in the English language.

Book found the Ish on an obscure world and accidentally brought back to the college as per his programming.

But now it's escaped, and is out to cause havoc on the speech centers of the human brain unless The Doctor can stop it.