Sirius and his team-mates develop a risky strategy to backtrack Block 13 which is retained Papa Charly. Foetus and Lucy Lee deliberately let themselves capture by the Black Squad. In the Marches, Elijah finds the trace of a loved she thought she had ... (more)lost. Meanwhile, in the Upper Town, Diane is close to Sorensen during his research; it might help to escape with Lou and Theo. But it is without counting Munro and his new sidekick, Emerson, determined to do the cleaning to get back in the good graces of Prometheus...