The primary suspect in the disappearance of Madeleine McCann insists in a jailhouse letter there’s “not even the smallest evidence” linking him to the British toddler – and that he’s being made a scapegoat to cover up errors in the early investigation.

Christian Brueckner, 45 — named a suspect in Madeleine’s 2007 disappearance last spring — is serving a seven-year prison sentence in Germany for the 2005 rape of an elderly American woman in Algarve, Portugal, near where the tot was last seen.

“You can never imagine how it is when the whole world believes you are a child murderer, and you are not,” Brueckner writes in one letter, a series of which have been released by MailOnline.

The convicted sex offender, who narrowly avoided prosecution for additional counts of rape and child sex abuse, insisted he “got told a long time ago that the prosecutor’s office was closing the Maddie case because there is not even the smallest evidence.”

“There will never be a trial,” he said.

Images of Brueckner’s cramped, penciled letters and sketches were posted just as investigators from Portugal, Germany, and the UK descended on the Barragem do Arade reservoir in Algarve. They were reportedly alerted to the site after a “very credible” informant confirmed claims Brueckner visited the area in the days after Madeleine vanished.

The teams spent three days scouring the area, apparently in search of a gun and a camcorder stolen from Brueckner’s Algarve home around the time the girl vanished. The camcorder is believed to contain evidence of rape and child sex abuse.

On Thursday, officials announced they seized a “number of items” from the scene.

In his missives, however, Brueckner states prosecutors are aware of “many [sic] material which confirms [his] innocence” but are trying to “create a monster…to let people think that I am the right one.”

Graphologist Tracey Trussell told MailOnline that Brueckner’s ramblings were evidence of “distorted, deluded” mind with “fantastical…unchanging” views.

She added the “long extended end stroke on the reclining letter S is symbolic of someone who suffers with feelings of guilt,” and that the language reflected his desire for “command and control.”

“Whatever the truth, there is a need to continually feed his ego, and his ultimate aim is to get some sort of recognition,” she concluded.

In one of the strange signed sketches, Brueckner depicted a daisy with the petals picked off alongside the words “guilty” and “not guilty.” A second picture shows a long, ominous stone hallway lined with doors.

In his latest letter, Brueckner – referred to as “Christian B.” in court docs because of Germany’s stringent privacy laws – makes pointed accusations about the McCann case’s investigative team and German police.

“I mean a gay investigator who is in love with a big criminal. Outrageous. Have you ever heard that a hunter is ****ing his prey?” he wrote.

“The torture I’m going through is the best evidence I can have.

“I’m not able to tell the real treatment I get because I don’t have the right words for it. Of course, this all happens by the orders of the BKA [German criminal police].”

In a previous letter, he complained of being treated worse than reviled Nazi war criminal Josef Goebbels, and in a letter from last year he compared prosecutor Hans Christian Wolers to Adolf Hitler.

Brueckner has also accused the prison staff of depriving him of outside visitors because they feared he’d get “sexual satisfaction” from interacting with other people.

“I even have to ask for the weekly jam and margarine that other inmates get automatically,” he griped.

In the most recent letter, the Wurzburg native insisted he is “tough as old boots.”

“Like I told you already. The responsibilities are not strong enough to admit the mistakes they made in the Maddie case. So they try despairingly to accuse me of other weird stuff,” he said of rape and child sex abuse allegations against him.

“It doesn’t matter that I have a completely different look like the victims are saying. I really would like to know what they tell them to convince them that it was me nevertheless.”

The letter concludes on an oddly optimistic note.

“I’m writing this without self-pity and my self-confidence and self-control was never at a higher level,” he declared. “What doesn’t kill you makes you stronger. Chin up! Better days are coming.”

Three-year-old Madeleine McCann, of Leicester, was last seen at her family’s holiday apartment in Praia de Luz on the night of May 3, 2007.

Her parents, Kate and Gerry McCann, left the tot and her infant siblings asleep while they dined nearby. When Kate checked on the children around 10 p.m., Madeleine was gone.

Last month, the couple issued a gut-wrenching statement to mark Madeleine’s 20th birthday, which took place just a few days after the 16th anniversary of her alleged abduction.

“Happy birthday Madeleine! We love you and we’re waiting for you. We’re never going to give up,” they wrote on Facebook.

“She’s still missing, still missed and we are never going to give up trying to find her.”