Combine 3 pieces of evidence which will clearly point to the time the fire occurred

Check GPS tracking and location of driver at the time of fire

The location of the house is present on another map

Carefully analyze the list of the club members and their relation to two of our suspects

There is a connection between the club members and the article in the newspaper

Check the web site listed on the matches

Check the time of the photos taken in the Adlers king club by Lukas, his friends and the Club itself.

Match the time of the photos with the duration needed (shown on the map) to reach the house from the club

The filled out treatment plan will look like the following:

Check the complaint from Walter Sievers

From the letter you can see that Alma Preuss had an affair with Joseph, she sent proof (jetton). Where was this letter was sent from?

Check the newspaper to know what happened on Mallorca at the same time

Closely check the registration of the visitors in hotel

Closely check the visual look of the visitors entering the hotel room

Registration of number 8 is fake, as visitors registered with the names of characters from Harry Potter (registration 8)

The lady in the picture is dressed similar to the kids drawing

The man on the picture is dressed similar to the man filling the fuel at the fuel station

Check the notebook with the encryption page

After decrypting the message, you will get that Joseph cancelled his trip with Alma as he had his wedding day on May24th

The wedding day is the key

The insurance documents in the website clearly indicate that Bremer was insured against fire and could claim the insurance benefits in such case.

Look closely to the medical report(s) one or more reports?