S2·E46 The Last Call

Episode recap

The episode opens with a series of unexplained explosions that occur when ordinary mobile phones are used, prompting panic across the city. Each incident is traced back to a seemingly innocuous telephone call that precedes the blast, leading the CID to suspect a coordinated sabotage rather than isolated accidents. As the death toll rises, the investigative unit mobilizes resources to identify a pattern among the victims and the devices involved.

Through forensic analysis of the damaged phones, the team discovers that a miniature electronic component has been covertly installed inside the handsets. The component is not part of the manufacturers’ standard design, indicating that the phones were tampered with after leaving the factory. Further inquiry reveals that the tampering is linked to a fraudulent repair operation that offered free or discounted servicing to the public. The operation, presented as a legitimate service, was in fact a front for embedding the hidden chips.

The CID follows the trail of the counterfeit repair shops, uncovering a network that distributed the altered devices throughout the metropolitan area. The investigation then turns to the technical specifications of the implanted chips, which match a prototype developed years earlier under the codename “EchoNet.” EchoNet was an experimental communications platform that was discontinued after failing to meet security standards. The resurfacing of its technology suggests that the current threat is built upon the abandoned project’s architecture.

Despite assembling a clear picture of the method—malicious calls triggering the hidden chips to detonate—the identity of the individual or group orchestrating the scheme remains elusive. The episode concludes with the CID acknowledging the need for further intelligence gathering to locate the mastermind behind the fake repair campaign and the revived EchoNet technology, leaving the case open for future resolution.