Shakedown ( novel ) This was also Terrance Dicks ' final contribution to the New Adventures series . However , he did write a partial sequel to this novel , " Mean Streets " , which is one of the Virgin Bernice Summerfield New Adventures " . " Publisher ' s summary . 1995 Virgin Books edition . " " The Sontaran s can never defeat us . It is we who will win . " " For thousands of years the Sontaran clone - warriors and the Rutan gestalt have fought each other across the galaxy . Now the Sontarans have a plan to strike at the heart of the Rutan Empire , and utterly defeat the Rutan race . The Doctor has his suspicions , but only one Rutan spy knows the Sontarans ' secret . He is being pursued from planet to planet by Chris and Roz and by a Sontaran hit squad . After a confrontation aboard the racing space - yacht " Tiger Moth " , the chase culminates on the library planet Sentarion — where Professor Bernice Summerfield ' s researches into the history of the Sontaran / Rutan war turn into explosive reality . 2014 BBC Books edition . For thousands of years the Sontarans and the Rutans have fought a brutal war across the galaxy . Now the Sontarans have a secret plan to destroy the Rutan race - a secret plan the Doctor is racing against time to uncover . Only one Rutan spy knows the Sontarans ' plan . As he is chased through the galaxy in a desperate bid for his life , he reaches the planet Sentarion - where Professor Bernice Summerfield ' s research into the history of the Sontaran - Rutan war is turning into an explosive reality . Plot . is a smuggler of Jekkerta weed on the planet Jekkar . Before he can take off from the planet , the Sontaran s land , planning to invade the planet . Kurt is arrested and detained , to be shot at dawn . In his cell , he wakes to find a small man who names himself " Smith " , also to be shot at dawn . However , Smith has been arrested for aiding a rebellion against the Sontarans . Sontaran Commander Steg briefs Kurt on his captivity before leaving the cell . Smith reveals to Kurt that he has been aiding the native species on Jekkar , the peaceful Jekkari , to fight back against the human colony . A Jekkari breaks down the cell door , prompting Smith ( the Doctor ) and Kurt to escape . They are spotted by a Sontaran trooper , who is killed by a second Jekkari . Kurt escapes Jekkar in his ship , and the Doctor stays with the Jekkari , who liberate the planet from the Sontarans , causing them to retreat . Years later , Chris Cwej and Roz Forrester arrive in Megacity , capital of Megarra , looking for a serial killer that dissects its victims and takes their identities and money . Garshak , a mentally augmented and supremely intelligent Ogron , brings them in for questioning as the head of police but releases them to continue their investigation , as the killer could well target the crime lords of the corrupt city . Gorsk , a Sontaran intelligence officer , identifies Chris and Roz in a hit on the police station , and marks them for death . The two Adjudicators track the “ Ripper ” to a nightclub , but cannot prevent it from killing and dissecting the nightclub ’ s owner , although they do manage to interrupt it before it can take on the identity of the victim , and wound the killer when it attempts to escape . A pack of Wolverine assassins hired by Gorsk ambush Chris and Roz as they chase the killer , but Garshak and his force save them in the nick of time . By this point , The Ripper has already left the planet for Space Station Alpha under his old identity , but Chris and Roz are persuaded to follow . Gorsk reports to Sontaran High Command on their battle station , the War Wheel and kills the Wolverine leader for his failure . Gorsk is then slaughtered by the remaining Wolverines out of revenge . While this has been happening , the Doctor sends Bernice Summerfield to the university on the desert planet Sentarion to research the Sontaran / Rutan conflict . Upon her arrival , she is targeted and almost murdered by a Harrubtii assassin - religious fanatics on Sentarion . " to be added "