One by Eve Smith

One law. One child. Seven million crimes...
A cataclysmic climate emergency has spawned a one-child policy in the UK, ruthlessly enforced by a totalitarian regime. Compulsory abortion of 'excess' pregnancies and mandatory contraceptive implants are now the norm, and families must adhere to strict consumption quotas as the world descends into chaos.
Kai is a 25-year-old `baby reaper´, working for the Ministry of Population and Family Planning. If any of her assigned families attempt to exceed their child quota, she ensures they pay the price.
Until, one morning, she discovers that an illegal sibling on her Ministry hit-list is hers. And to protect her parents from severe penalties, she must secretly investigate before anyone else finds out.
Kai's hunt for her forbidden sister unearths much more than a dark family secret. As she stumbles across a series of heinous crimes perpetrated by the people she trusted most, she makes a catastrophic discovery that could bring down the government ... and tear her family apart.