Yellow Book of Riddles

Morrowind

 * Jobasha's Rare Books, Vivec (City)
 * Vasesius Viciulus: Trader, Molag Mar
 * Dorisa Darvel - Bookseller, Balmora

Skyrim

 * The Arcanaeum in The College of Winterhold.
 * The Frozen Hearth in Winterhold.
 * The Scorched Hammer in Riften.
 * Fellglow Keep - Living quarters.
 * Outside the entrance to North Skybound Watch.
 * Bards College, Solitude; On one of the bookshelves in the library area.
 * Can be bought from Urag gro-Shub in the Arcanaeum.
 * In one of the bedrooms, Snow-Shod Manor, Riften.
 * On the Dainty Sload, on a bookshelf in the Captain's quarters.
 * Found on the body of a Vampire Fledgling in Bloodlet Throne.
 * In Uthgerd the Unbroken's House.
 * In the children's room of Proudspire Manor, Solitude.

Content
A small book of riddles.

For earnest pleasure and strengthening of the mind, the author here collects all that he has learned of the art of riddling, by dint of diligent study, and through years of discourse with others of similar inclination.

The posing and puzzling of riddles is a convention of polite aristocratic Western society. Nobles and social aspirants collect books of riddles and study them, hoping thereby to increase the chances of their appearing sly and witty in conversation.

A metal neither black nor red

As heavy as man's golden greed

What you do to stay ahead

With friend or arrow or steed.

dael :rewsnA ehT

A man says, "If you lie to me I will slay you with my sword. If you tell me the truth, I will slay you with a spell." What must you say to stay alive? {C}.drows a htiw em yals lliw uoY :rewsnA ehT

A Bosmer was slain. The Altmer claims the Dunmer is guilty. The Dunmer says the Khajiit did it. The Orc swears he didnt' kill the Bosmer. The Khajiit says the Dunmer is lying. If only one of these speaks the truth, who killed the Bosmer?

crO ehT :rewsnA ehT***


 * This answer could also be the Altmer is guilty and then the Orc says the true statement!

Trivia

 * Due to Skyrim's random generation engine for book covers, the 'Yellow' book of riddles can appear red, blue, green, or indeed any other standard book color.
 * May be given to an adopted child, earning The Gift of Charity, (Hearthfire).