Part of today’s Kindle ebook deal of the day over at Amazon is the Douglas Adams novel Long Dark Tea-Time of the Soul, the follow-up to Dirk Gently’s Holistic Detective Agency, for only $1.99 (that’s 75% off the regular price of $7.99). If you’d like to purchase a physical copy of Long Dark Tea-Time of the Soul, the book is also available in mass market paperback.

Note – this deal is valid only for today, Monday, December 23, 2013, until 11:59pm PST.

Be sure to check out this month’s Kindle deals: 100 Kindle Books For $3.99 or Less, which includes Stardust by Neil Gaiman for $1.99; Stephen King’s The Shining for $3.99; The Last Policeman: A Novel by Ben H. Winters for $2.79; and Divergent by Veronica Roth for $3.99.

As many of you know, while he was working on the Hitchhiker’s Guide to the Galaxy, Douglas Adams cut his teeth and refined his craft with the crew of Doctor Who, back when Tom Baker was portraying the fourth incarnation of the Doctor. Adams served as script editor for the series, and also is credited as writing a few episodes of the show.

One of the most infamous episodes written by Adams was once called Shada. This Doctor Who serial was never completed or fully broadcast due to industrial action and protests that happened at the time.

Where am I going with this? Well, as it turns out, the BBC is about to launch a new show called Dirk Gently; which is based on the novels Dirk Gently’s Holistic Detective Agency and The Long Dark Tea-Time of the Soul written by Douglas Adams. These two novels, in part, form the basis of the unaired Shada episode of Doctor Who.

Essentially, what happened was Adams decided to take the concepts he really enjoyed from the unaired episode and created a whole new adventure focusing on the detective known as Dirk Gently.