In 2015, a woman from Stockholm, Sweden, struck up a relationship with 38-year-old Martin Trenneborg

 In 2015, a woman from Stockholm, Sweden, struck up a relationship with 38-year-old Martin Trenneborg. The duo chatted over the phone, during which Trenneborg claimed that he was a rich American stockbroker based in London.

The woman was impressed. She invited Trenneborg over to her flat on the 10th of September, 2015. They spent the evening chatting, and the woman agreed to have a second date with Trenneborg.

On the 15th of September, the woman invited Trenneborg over to her flat once again. When she opened the door, Trenneborg presented her with champagne and chocolate-dipped strawberries. The duo sat down on the couch, and began to eat and drink.

Trenneborg was not actually an American stockbroker. He had a successful career as a doctor, which was just as impressive. However, there was a reason that Trenneborg had lied about his true identity.

Trenneborg had drugged the strawberries with the powerful sedative, Rohypnol. He marked the drugged ones by drawing on the stem leaves, so he knew which ones to present to his victim and which ones to eat himself.

After a while, the woman began to feel drowsy, before she fell unconscious. Once she was immobilised, Trenneborg raped the woman, before finding a wheelbarrow and placing her in it. He then pushed the wheelbarrow to his car which was parked outside. He lifted the woman out of the wheelbarrow and then bundled her into his car.

From here, Trenneborg drove the woman 350 miles to his home at Kristianstad. He had brought along two rubber masks – one of an elderly man and another of a bearded man. He had put one of these masks on his victim and one of the masks on himself to conceal their identities.

Trenneborg had been preparing for this moment for quite some time. Over the course of the past five years, Trenneborg had been building a hidden bunker which was concealed as a machine shed next to his countryside home.