«The Death Room II: Cab Number 538 s Driver» is the fourth book of the Dark Collection and the continuation of the «The Death Room» Dark Collection s third book.

Living anonymously in Twös home country, accompanied by Two, Three and Her, He finds himself definitely surrendered to the strangely familiar environment he created through the kidnappings. With a new death room already assembled, the appearence of another serial killer in the picture disturbs the stability and puts His and Twös freedom at risk.

Confronted with the possibility of losing and, on top of that, with the discovery of Three s pregnancy, He has no choice but to accept Twös father aid.