Everything you need to understand or teach Solitaire (Heartstopper Series) by Alice Oseman.
Solitaire is a stand-alone novel by Alice Oseman that follows a minor character from her Heartstopper graphic novel series. Tori Spring is the older sister of Charlie, the central character of the main book series. Unlike her charming little brother, Tori is depressed and misanthropic. However, during her junior year of high school, a prankster and the arrival of two transfer students change her outlook on life. The novel explores mental illness, friendship, technology, stories, and growing up.