Nightwatching

Mystery thriller about a mother, who, one night when she's home alone with her two young children, sees an intruder in her house. Desperate, she and her children escape into an hidden room. 
The beginning was already extremely tense, the author using great imagery and words to convey the tension and danger, the heart pounding threat of being preyed upon. A little before the midway of the book, the plot goes into a direction I didn't expected (or expected later on) but I didn't mind it at all. I felt it was really interesting afterwards to see chapters with a slower pace, still underlined by tension but with a sort of surreal quality added to it that mirrored the main character's situation. The last chapters restarted the frantic tension and danger, and the ending was really satisfying for me. 
The style felt very lush and intricate with a sort of litfic quality in the writing that I absolutely loved. 
I also really liked the main character, her resilience and courage.  Throughout the novel we see flashbacks of her life, her thoughts and feelings on what is happening to her; the author perfectly exploring themes of motherhood, family, gaslighting, mental health, survival.  
Overall a stunning debut novel, a real page turning thriller with gorgeous prose, I'm looking forward to read more by Tracy Sierra.