In Ticker, by Lisa Mantchev, we follow Penelope Farthing (who rides a motorized velocipede, lol), her twin brother, and their friends on a romp of suspense and intrigue as they try to track down the Farthings' kidnapped parents and the now-madman who was once the family's trusted friend and physician.
Penny was born with the same defect of the heart which claimed the lives of both her sisters; after a traumatic accident, Warwick surgically removed Penny's biological heart and implanted what was only meant to be a prototype of its eventual clockwork replacement. However, when the truth comes out about how Warwick developed and tested the clockwork "Ticker" on people he abducted off the street, the family is shocked, and Penny becomes unkindly known as the first of the "augmented" - an abomination in the eyes of some. But Warwick's trial is underway; maybe once he has been convicted, the family can begin to move on and try to find some peace.
The day of the verdict goes anything but smooth, however - there's an explosion at the Farthing family's factory, where Penny was on her way to meet her brother. On top of this, their parents have been abducted, and the ransom demands not money, but the family's Augmentation research. With what seems a little twist at every turn, will Penny and her friends be able to find her parents before any harm comes to them? Will she even be able to solve this before her worn-out prototype Ticker finally gives out?




