In *Kingdom Come: Deliverance 2*, a crucial side quest involving Rosa's book is easily missed, leading to a failed quest and potentially missed romance opportunities. This guide ensures you don't miss out.
Unlocking Rosa's Book Side Quest
Before Rosa requests her book, complete "Via Argentum" and begin "Taking French Leave." After resolving the Vavak situation with the Ruthards (through force or diplomacy), speak with Rosa. She'll mention a secret Maleshov passage for rescuing Hans and then ask you to retrieve her book. Inquire about the book's specifics and agree to retrieve it to initiate "Rosa's Book."

This quest is only available during "Taking French Leave." Leaving Maleshov without the book results in quest failure and prevents a potential romance with Rosa.
Locating Rosa's Book
Upon entering Maleshov, Hans is in the tallest tower's top floor. Use the external stairs to enter. Inside, find another stairwell and a small kitchen. Wait in the kitchen until the guards above leave.

Stealthily ascend the stairs. In the room, subdue Lady Ofka, take her keys, the keys from the podium, and the sword from the chest. Rosa's book is a red volume in a window alcove to the fireplace's right. Grab it; your objective will update.

While there, acquire the sword from the adjacent room's chest. This provides the two weapons needed for Hans and his guest, saving time later. Unlock the door on the tower's top floor to trigger a cutscene.
Completing the Quest
Following the cutscene, continue "Taking French Leave." Guide Hans to the stables, clearing the path. After the final cutscene, return to Kuttenberg City and deliver Rosa's book to her at Ruthard Palace, concluding the quest.