The following page of our guide to Marvel's Spider-Man provides a walkthrough for the "Step Into My Parlour" mission. You'll be facing the longest and the most difficult sneaking sequence in the game. MJ plans to break into Osborn's house!
Start the mission by going to the yellow marker. MJ will encounter a few groups of anxious people - talk to them and instigate them to act. After several dialogues the security will appear, sneak behind their backs and enter the open door.
Proceed and pick up the taser. It will come in handy in this mission - you can stun the enemies, when you manage to get behind them. Try it out on the security guard that happened to be nearby. Somebody was saying something about weaker sex?
Hide behind the trash bin and get the attention of a Sable's mercenary using the sensor. Stun him and be on your way. Enter the room with security monitors and take down another guy. Get on the computer and activate the elevator.
Go through the door, and enter the room with people. Wait for Osborn, Silver Sable and their lackeys to show up. Look for a chance to sneak into the opened elevator - it will take MJ to the unguarded Osborn residence.
Once here, you can relax a bit and get busy with going through Osborn's things in subsequent rooms. You'll find a lot of examinable stuff here, many of the providing optional info, trivia, and little tidbits for the fans.
Put on the prototype mask and look at the wall. It will detect a hidden room - approach the painting and push the button. Then, try to use the panel - turn out you'll need a special code.
Approach the dining table and pick up a note. You'll learn that the code for the lock is the date on which Harry left his home.
Nearby, you'll find a locked room - it's Harry's room. To get the key, you'll need to enter Osborn's bedroom, examine the frame of his wife's photograph and turn it around.
Enter Harry's room and read his journal to learn about his illness. And now it's back to sneaking. Head left and move behind the next cover. Wait until no one is patrolling the area and run towards the yellow marker.
Wait for a bit and stun the first guard you see.
Enter the kitchen and take a spot where you can monitor the situation in the guest room. When the coast is clear, proceed and hide in the corridor leading to the elevator.
Wait for the guard to stop and run to the left. Use the code to enter the secret room.
Approach the table. You'll need to set the plan so to align the VIP, the Oscorp building and the Sable patrol - this will enable you to locate the Devil's Breath laboratory. The solution to the puzzle can be seen on the screenshot above - you'll also need to see an important cut-scene, from which you'll learn the truth of Mister Negative's past.
Unfortunately, MJ will make some noise, which will get the attention of Silver Sable. Exit the room and head right. Hide in the elevator corridor and wait for the guard to pass. The, proceed to the right and enter the dining room.
Stun the mercenary and enter the room with the pool. Inside, you'll find one more guy to shock with your "charms".
You'll have to reach the balcony while avoiding subsequent enemies, where you'll find one last guy waiting to be dazed. Sable will finally catch up to MJ, leaving her with no option but to take the plunge; luckily Peter appeared in time to save the brave reporter. Here's a healthy 5000 XP for you for completing the mission.