Lock, in particular mortise lock

A lock for a door, comprising:

• a housing including an opening;
• a latch bolt and a further bolt both mounted to said housing for parallel displacement relative to said housing, said further bolt being actuated for ›its! said parallel displacement by a key;
• a latch follower formed as part of a latch and connected to said latch bolt;
• changer means connected to said latch bolt, the parallel displacement of said latch bolt occurring due to the action of one of said latch follower by the latch and said
• changer means by the key;
• a lock cylinder situated in said opening;
• a first drive rod located on each side of said latch bolt and said further bolt;
• a first control plate connected to said first drive rod on each of said sides;
• a changer lever hinged to said first control plate and connected to said lock cylinder;
• a second drive rod located on the side of one of said latch bolt and said further bolt;
• and
• a second control plate connected to said second drive rod and said changer lever, wherein said changer means can be driven by said lock cylinder by said changer lever and said first control plate.