A lock cassette includes at least one lock bolt connecting piece, adapted for releasable engagement with a lock cassette engaging end portion of a door integrated lock bolt of a door when the lock cassette is mounted in a lock cassette receiving cavity of the door, a lock bolt maneuvering mechanism, configured to displace the at least one lock bolt connecting piece between an extended position and a retracted position, to thereby displace the lock bolt between an extended position and a retracted position, and at least one lock bolt locking arrangement, configured to lock the movability of the at least one lock bolt connecting piece when a locking action is effected, and unlock the movability of the at least one lock bolt connecting piece when an unlocking action is effected.