The Dinner Club by Saskia Noort

Karen has recently moved with her family to a village outside of Amsterdam. Feeling lonely, she's grateful when she becomes part of a group of female friends called the dinner club. The well-to-do women get together chat, eat, and drink--sometimes with the husbands along. Then one of the husbands sets fire to his house while he and his family are inside. Soon after, Karen's best friend in the group, Hanneke, takes her own life. Karen is stunned by all the tragedy around her especially when it appears that the recent events point to murder rather than suicide. Karen struggles to maintain her life while uncovering the secrets of her friends and being tempted into adultery. The Dinner Club reminded me a bit of the novels of Nicci French.