"I'd like you to find the person who killed my son."

The tone is set with Charlotte Perle's first words to Magali Rousseau. No ordinary request, this – it's one that calls for empathy, tenacity, thoroughness. Qualities which Magali has in abundance.

And the bond between the two women grow into something far beyond the search for a murderer. Friendship, love, a deep and lasting complicity - Magali's life is utterly changed by the arrival of Charlotte. Which is all to the good, except for one serious drawback - the risk of losing it. A risk which, in this line of work, can become reality any time.

One Green Bottle, Cash in Carry, Perfume Island, Mystery Manor - the four novels in this box set highlight Magali and Charlotte in four different investigations, spread over two years. From the hunt for a serial killer to a devastating journey into horror, these books form an unforgettable exploration of darkness. But one in which, with a friendship like theirs, there is always a place for laughter, always the possibility of light.