Borrowed and Lost is a in Torment: Tides of Numenera.
- This quest can be acquired by talking to Falinda in Circus Minor.
- The book Falinda is looking for can be found in the Buried Crossroads, a former lair of the Changing God.
- The Buried Crossroads can first be accessed by starting the side quest Shaky Foundations, it's entrance is in the SW corner of the Sticha Lair. Alternatively you can take a more direct route to the crossroads by following The Cold, Calculating Jack questline.
- (Before returning it to Falinda, it's a good idea to read The Tome of Singing Thorns and attempt to solve it's puzzle.)
- Return the tome to Falinda in Circus Minor to complete the quest, Falinda will then offer to give the Last Castoff a different (less valuable) book as thanks for finally returning The Tome of Singing Thorns. You can choose to decline her offer for a small increase in the Last Castoff's Gold Tides.
- One of Falinda's extra books or a small increase in Gold Tides.
- The Changing God borrowed The Tome of Singing Thorns at least a decade prior while still using the Last Castoff's body, this is why Falinda only refers to the Last Castoff as "thief."